diff --git a/.vscode/settings.json b/.vscode/settings.json index deed16155..5cd5a878d 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -50,6 +50,8 @@ "bijective", "bmatrix", "boldsymbol", + "boxplot", + "boxplots", "brentq", "Bressan", "bysource", @@ -276,6 +278,7 @@ "savgol", "SBMT", "scilimits", + "scipy", "searchsorted", "seblm", "seealso", @@ -295,6 +298,7 @@ "statsmodels", "STFT", "subintervals", + "supremum", "suptitle", "supxlabel", "supylabel", diff --git a/CHANGELOG.md b/CHANGELOG.md index 6a2503d23..e18389355 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -32,6 +32,7 @@ Attention: The newest changes should be on top --> ### Added +- ENH: Implement Multivariate Rejection Sampling (MRS) [#738] (https://github.com/RocketPy-Team/RocketPy/pull/738) ### Changed diff --git a/docs/notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/mrs.errors.txt b/docs/notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/mrs.errors.txt new file mode 100644 index 000000000..e69de29bb diff --git a/docs/notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/mrs.inputs.txt b/docs/notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/mrs.inputs.txt new file mode 100644 index 000000000..0d68c2376 --- /dev/null +++ b/docs/notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/mrs.inputs.txt @@ -0,0 +1,116 @@ +{"elevation": 113, "gravity": "Function from R1 to R1 : (height (m)) \u2192 (gravity (m/s\u00b2))", "latitude": 39.3897, "longitude": -8.288964, "wind_velocity_x_factor": 1.0, "wind_velocity_y_factor": 1.0, "datum": "SIRGAS2000", "timezone": "UTC", "ensemble_member": 6, "radius": 0.06350803185536065, "mass": 15.321391102645253, "I_11_without_motor": 6.321, "I_22_without_motor": 6.318074651079169, "I_33_without_motor": 0.02231558279750141, "I_12_without_motor": 0, "I_13_without_motor": 0, "I_23_without_motor": 0, "power_off_drag": "Function from R1 to R1 : (Mach Number) \u2192 (Drag Coefficient with Power Off)", "power_on_drag": 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"y_impact": -2233.5224936504483, "apogee_x": 342.6420557007235, "impact_velocity": -5.0536322930466415, "max_mach_number": 0.8776095475993376, "x_impact": 543.254833778517, "out_of_rail_stability_margin": 2.7420404711926567, "apogee_time": 24.927219754664154} +{"apogee": 3797.5685972755605, "frontal_surface_wind": -4.271281822636469, "apogee_y": 847.03730135533, "lateral_surface_wind": -4.995883805192391, "t_final": 332.6286050088647, "out_of_rail_velocity": 27.89720179659139, "initial_stability_margin": 2.510851371297206, "out_of_rail_time": 0.33523312132374716, "y_impact": -2655.046217522149, "apogee_x": 446.4895818474621, "impact_velocity": -5.043918650427335, "max_mach_number": 0.9951307131929221, "x_impact": 503.23943346387705, "out_of_rail_stability_margin": 2.583526365506102, "apogee_time": 26.54502604807747} +{"apogee": 3931.8125014034595, "frontal_surface_wind": -4.338701763270172, "apogee_y": 995.9132686955533, "lateral_surface_wind": -5.401698254601444, "t_final": 342.1561385206134, "out_of_rail_velocity": 29.035956116422845, "initial_stability_margin": 2.4389750050322876, "out_of_rail_time": 0.32484117963911396, "y_impact": -2406.75427808376, "apogee_x": 575.337097612752, "impact_velocity": -4.987091825094103, "max_mach_number": 1.0612884839917596, "x_impact": 311.2096058484707, "out_of_rail_stability_margin": 2.51075512259, "apogee_time": 26.748632732169362} +{"apogee": 3775.519117764259, "frontal_surface_wind": -4.2673310011136385, "apogee_y": 1012.1630087253565, "lateral_surface_wind": -4.686739641551506, "t_final": 329.76719462826645, "out_of_rail_velocity": 27.813068853184667, "initial_stability_margin": 2.6358526092723222, "out_of_rail_time": 0.3367177328106602, "y_impact": -2076.0543308050433, "apogee_x": 562.7430471902774, "impact_velocity": -5.1926133757981106, "max_mach_number": 0.984126098366045, "x_impact": 357.85582522464983, "out_of_rail_stability_margin": 2.701924050490265, "apogee_time": 26.554336876622784} +{"apogee": 3680.2721850439743, "frontal_surface_wind": -3.677153100121104, "apogee_y": 880.8014996972406, "lateral_surface_wind": -5.355176676306832, "t_final": 327.6849456765257, "out_of_rail_velocity": 27.310385026108975, "initial_stability_margin": 2.6119715923106637, "out_of_rail_time": 0.34100761441326133, "y_impact": -2450.0143097047876, "apogee_x": 365.0274800258772, "impact_velocity": -5.204034122601761, "max_mach_number": 0.9585733084753566, "x_impact": 185.89141022126375, "out_of_rail_stability_margin": 2.68215369298615, "apogee_time": 26.275019429687855} +{"apogee": 3431.650190011215, "frontal_surface_wind": -4.396499582018061, "apogee_y": 956.7441573583344, "lateral_surface_wind": -4.270194469349204, "t_final": 307.2456083272591, "out_of_rail_velocity": 26.318793569073883, "initial_stability_margin": 2.510923089103543, "out_of_rail_time": 0.35106022759252603, "y_impact": -1637.1021653899293, "apogee_x": 617.2623183698954, "impact_velocity": -5.296386806224455, "max_mach_number": 0.9002908675623732, "x_impact": 151.79827164553308, "out_of_rail_stability_margin": 2.584114299407272, "apogee_time": 25.58263955885719} +{"apogee": 4048.414976487407, "frontal_surface_wind": -4.345265988631907, "apogee_y": 980.7802377662935, "lateral_surface_wind": -5.396419230601599, "t_final": 336.8046289600785, "out_of_rail_velocity": 28.896917789586105, "initial_stability_margin": 2.5787340512638015, "out_of_rail_time": 0.3260160774314721, "y_impact": -2409.6210051643197, "apogee_x": 513.199760638137, "impact_velocity": -5.244512661768816, "max_mach_number": 1.0513832163562005, "x_impact": 267.6088382839362, "out_of_rail_stability_margin": 2.6450942821085452, "apogee_time": 27.337191733480473} +{"apogee": 3966.969352562571, "frontal_surface_wind": -4.158367086202538, "apogee_y": 924.5121992216217, "lateral_surface_wind": -4.843918200397008, "t_final": 339.20911020669985, "out_of_rail_velocity": 28.560796443914143, "initial_stability_margin": 2.6601006872937387, "out_of_rail_time": 0.3289462786117325, "y_impact": -2415.254283439537, "apogee_x": 516.122510910166, "impact_velocity": -5.2539984713720935, "max_mach_number": 1.0308784546640217, "x_impact": 375.91530427578294, "out_of_rail_stability_margin": 2.7279871054629226, "apogee_time": 27.070775305932848} diff --git a/docs/reference/classes/MultivariateRejectionSampler.rst b/docs/reference/classes/MultivariateRejectionSampler.rst new file mode 100644 index 000000000..8f70b8a2d --- /dev/null +++ b/docs/reference/classes/MultivariateRejectionSampler.rst @@ -0,0 +1,5 @@ +MultivariateRejectionSampler Class +---------------------------------- + +.. autoclass:: rocketpy.MultivariateRejectionSampler + :members: diff --git a/docs/reference/index.rst b/docs/reference/index.rst index c0868c0c5..de3b36ac8 100644 --- a/docs/reference/index.rst +++ b/docs/reference/index.rst @@ -20,6 +20,7 @@ This reference manual details functions, modules, methods and attributes include classes/EnvironmentAnalysis Monte Carlo Analysis Sensitivity Analysis + Multivariate Rejection Sampler .. toctree:: :maxdepth: 2 diff --git a/docs/user/index.rst b/docs/user/index.rst index e734abe5d..f23eae25a 100644 --- a/docs/user/index.rst +++ b/docs/user/index.rst @@ -35,7 +35,8 @@ RocketPy's User Guide ../notebooks/monte_carlo_analysis/monte_carlo_class_usage.ipynb ../notebooks/monte_carlo_analysis/monte_carlo_analysis.ipynb ../notebooks/monte_carlo_analysis/parachute_drop_from_helicopter.ipynb - sensitivity.rst + Sensitivity Analysis + Multivariate Rejection Sampler .. toctree:: :maxdepth: 2 diff --git a/docs/user/mrs.rst b/docs/user/mrs.rst new file mode 100644 index 000000000..ec598960e --- /dev/null +++ b/docs/user/mrs.rst @@ -0,0 +1,278 @@ +.. _MRS: + +Multivariate Rejection Sampling +=============================== + +Multivariate Rejection Sampling allows you to quickly subsample the results of a +previous Monte Carlo simulation to obtain the results when one or more variables +have a different probability distribution without having to re-run the simulation. + +We will show you how to use the :class:`rocketpy.MultivariateRejectionSampler` +class to possibly save time. It is highly recommended that you read about Monte +Carlo simulations. + +Motivation +---------- + +As discussed in :ref:`sensitivity-practical`, there are several sources of +uncertainty that can affect the flight of a rocket, notably the weather and +the measurements errors in design parameters. Still, it is desirable that the flight +accomplishes its goal, for instance reaching a certain apogee, as well as staying under +some safety restrictions, such as ensuring that the landing point is outside +of a given area. + +Monte Carlo simulation is a technique that allows us to quantify the uncertainty and +give objective answers to those types of questions in terms of probabilities and +statistics. It relies on running several simulations under different conditions +specified by probability distributions provided by the user. Hence, depending on the +inputs and number of samples, running these Monte Carlo simulations might take a while. + +Now, imagine that you ran and saved the Monte Carlo simulations. Later, you need new a +Monte Carlo simulation with different probability distributions that are somewhat close +to the original simulation. The first straightforward option is to just re-run the +monte carlo with the new arguments, but this might be time consuming. A second option +is to use a sub-sampler that leverages the existing simulation to produce a new sample +that conforms to the new probability distributions. The latter completely avoids +the necessity of re-running the simulations and is, therefore, much faster. + +The Multivariate Rejection Sampler, or just MRS, is an algorithm that sub-samples the +original results based on weights proportional to the ratio of the new and old +probability distributions that have changed. The final result has a smaller sample size, +but their distribution matches the one newly specified without having to re-run +the simulation. + +The time efficiency of the MRS is especially interesting in two scenarios: quick testing +and tight schedules. Imagine you have an initial design and ran a huge robust monte +carlo simulation but you are also interested in minor variations of the original +design. Instead of having to run an expensive monte carlo for each of these variations, +you can just re-sample the original accordingly. For tight schedules, it is not +unheard of cases where last minute changes have to be made to simulations. The MRS might +then allow you to quickly have monte carlo results for the new configuration when a +full simulation might just take more time than available. + +Importing and using the MRS +--------------------------- + +We now show how to actually use the :class:`rocketpy.MultivariateRejectionSampler` +class. We begin by importing it along with other utilities + +.. jupyter-execute:: + + from rocketpy import MultivariateRejectionSampler, MonteCarlo + import numpy as np + from scipy.stats import norm + +The reference monte carlo simulation used is the one from the +"monte_carlo_class_usage.ipynb" notebook with a 1000 samples. A +MultivariateRejectionSampler object is initialized by giving two file paths, one +for the prefix of the original monte carlo simulation, and one for the output of the +sub-samples. The code below defines these strings and initializes the MRS object + + +.. jupyter-execute:: + + monte_carlo_filepath = ( + "notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/monte_carlo_class_example" + ) + mrs_filepath = "notebooks/monte_carlo_analysis/monte_carlo_analysis_outputs/mrs" + mrs = MultivariateRejectionSampler( + monte_carlo_filepath=monte_carlo_filepath, + mrs_filepath=mrs_filepath, + ) + +Running a monte carlo simulation requires you to specify the distribution of +all parameters that have uncertainty. The MRS, however, only needs the previous and new +distributions of the parameters whose distribution changed. All other random parameters +in the original monte carlo simulation retain their original distribution. + +In the original simulation, the mass of the rocket had a normal distribution with mean +:math:`15.426` and standard deviation of :math:`0.5`. Assume that the mean of this +distribution changed to :math:`15` and the standard deviation remained the same. To +run the mrs, we create a dictionary whose keys are the name of the parameter and the +value is a 2-tuple: the first entry contains the pdf of the old distribution, and the +second entry contains the pdf of the new distribution. The code below shows how to +create these distributions and the dictionary + +.. jupyter-execute:: + + old_mass_pdf = norm(15.426, 0.5).pdf + new_mass_pdf = norm(15, 0.5).pdf + distribution_dict = { + "mass": (old_mass_pdf, new_mass_pdf), + } + +Finally, we execute the `sample` method, as shown below + +.. jupyter-execute:: + :hide-code: + :hide-output: + + np.random.seed(seed=42) + +.. jupyter-execute:: + + mrs.sample(distribution_dict=distribution_dict) + +And that is it! The MRS has saved a file that has the same structure as the results of +a monte carlo simulation but now the mass has been sampled from the newly stated +distribution. To see that it is actually the case, let us import the results of the MRS +and check the mean and standard deviation of the mass. First, we import in the same +way we import the results from a monte carlo simulation + + +.. jupyter-execute:: + + mrs_results = MonteCarlo(mrs_filepath, None, None, None) + mrs_results.import_results() + +Notice that the sample size is now smaller than 1000 samples. Albeit the sample size is +now random, we can check the expected number of samples by printing the +`expected_sample_size` attribute + +.. jupyter-execute:: + + print(mrs.expected_sample_size) + +Now we check the mean and standard deviation of the mass. + +.. jupyter-execute:: + + mrs_mass_list = [] + for single_input_dict in mrs_results.inputs_log: + mrs_mass_list.append(single_input_dict["mass"]) + + print(f"MRS mass mean after resample: {np.mean(mrs_mass_list)}") + print(f"MRS mass std after resample: {np.std(mrs_mass_list)}") + +They are very close to the specified values. + +Comparing Monte Carlo Results +----------------------------- + +Alright, now that we have the results for this new configuration, how does it compare +to the original one? Our rocket has, on average, decreased its mass in about 400 grams +while maintaining all other aspects. How do you think, for example, that the distribution +of the apogee has changed? Let us find out. + +First, we import the original results + +.. jupyter-execute:: + + original_results = MonteCarlo(monte_carlo_filepath, None, None, None) + +Prints +^^^^^^ + +We use the `compare_info` method from the `MonteCarlo` class, passing along +the MRS monte carlo object as argument, to print a summary of the comparison + +.. jupyter-execute:: + + original_results.compare_info(mrs_results) + +This summary resemble closely the printed information from one monte carlo simulation +alone, with the difference now that it has a new column, "Source", that alternates the +results between the original and the other simulation. To answer the question proposed +earlier, compare the mean and median of the apogee between both cases. Is it what you +expected? + + +Histogram and boxplots +^^^^^^^^^^^^^^^^^^^^^^ + +Besides printed comparison, we can also provide a comparison for the distributions in +the form of histograms and boxplots, using the `compare_plots` method + + +.. jupyter-execute:: + + original_results.compare_plots(mrs_results) + +Note that the histograms displays three colors. Two are from the sources, as depicted +in the legend, the third comes from the overlap of the two. + +Ellipses +^^^^^^^^ + +Finally, we can compare the ellipses for the apogees and landing points using the +`compare_ellipses` method + +.. jupyter-execute:: + + original_results.compare_ellipses(mrs_results, ylim=(-4000, 3000)) + +Note we can pass along parameters used in the usual `ellipses` method of the +`MonteCarlo` class, in this case the `ylim` argument to expand the y-axis limits. + +Time Comparison +--------------- + +Is the MRS really much faster than just re-running a Monte Carlo simulation? +Let us take a look at some numbers. All tests ran in a Dell G15 5530, with 16 +13th Gen Intel® Core™ i5-13450HX CPUs, 16GB RAM, running Ubuntu 22.04. Each function +ran 10 times, and no parallelization was used. + +To run the original monte carlo simulation with 1000 samples it took, +on average, about 644 seconds, that is, 10 minutes and 44 seconds. For the MRS described +here, it took, on average, 0.15 seconds, with an expected sample size of 117. To re-run +the monte carlo simulations with 117 samples it took, on average, 76.3 seconds. Hence, +the MRS was, on average, (76.3 / 0.15) ~ 500 times faster than re-running the monte +carlo simulations with the same sample size provided by the MRS. + + +Sampling from nested parameters +------------------------------- + +To sample from parameters that are nested in inner levels, use a key name +formed by the name of the key of the outer level concatenated with a "_" and +the key of the inner level. For instance, to change the distribution +from the "total_impulse" parameter, which is nested within the "motors" +parameter dictionary, we have to use the key name "motors_total_impulse". + + +.. jupyter-execute:: + + old_total_impulse_pdf = norm(6500, 1000).pdf + new_total_impulse_pdf = norm(5500, 1000).pdf + distribution_dict = { + "motors_total_impulse": (old_total_impulse_pdf, new_total_impulse_pdf), + } + mrs.sample(distribution_dict=distribution_dict) + +Finally, if there are multiple named nested structures, we need to use a key +name formed by outer level concatenated with "_", the structure name, "_" and the +inner parameter name. For instance, if we want to change the distribution of +the 'root_chord' of the 'Fins', we have to pass as key +'aerodynamic_surfaces_Fins_root_chord' + +.. jupyter-execute:: + + old_root_chord_pdf = norm(0.12, 0.001).pdf + new_root_chord_pdf = norm(0.119, 0.002).pdf + distribution_dict = { + "aerodynamic_surfaces_Fins_root_chord": ( + old_root_chord_pdf, new_root_chord_pdf + ), + } + mrs.sample(distribution_dict=distribution_dict) + +A word of caution +----------------- + +Albeit the MRS provides results way faster than running the simulation again, it +might reduce the sample size drastically. If several variables undergo +changes in their distribution and the more discrepant these are from the original +ones, the more pronounced will be this sample size reduction. If you need the monte +carlo simulations to have the same sample size as before or if the expected sample size +from the MRS is too low for you current application, then it might be better to +re-run the simulations. + +References +---------- + +[1] CEOTTO, Giovani H., SCHMITT, Rodrigo N., ALVES, Guilherme F., et al. RocketPy: six +degree-of-freedom rocket trajectory simulator. Journal of Aerospace Engineering, 2021, +vol. 34, no 6, p. 04021093. + +[2] CASELLA, George, ROBERT, Christian P., et WELLS, Martin T. Generalized accept-reject +sampling schemes. Lecture notes-monograph series, 2004, p. 342-347. \ No newline at end of file diff --git a/docs/user/sensitivity.rst b/docs/user/sensitivity.rst index 7cac7d980..624fe559e 100644 --- a/docs/user/sensitivity.rst +++ b/docs/user/sensitivity.rst @@ -85,8 +85,8 @@ value of that parameter, i.e. the measured value by the instrument, and the "motors_grain_initial_inner_radius": {"mean": 15 / 1000, "std": 0.375 / 1000}, "motors_grain_outer_radius": {"mean": 33 / 1000, "std": 0.375 / 1000}, # Parachutes - "parachutes_cd_s": {"mean": 10, "std": 0.1}, - "parachutes_lag": {"mean": 1.5, "std": 0.1}, + "parachutes_Main_cd_s": {"mean": 10, "std": 0.1}, + "parachutes_Main_lag": {"mean": 1.5, "std": 0.1}, # Flight "heading": {"mean": 53, "std": 2}, "inclination": {"mean": 84.7, "std": 1}, diff --git a/rocketpy/__init__.py b/rocketpy/__init__.py index e0436bf02..1e7731073 100644 --- a/rocketpy/__init__.py +++ b/rocketpy/__init__.py @@ -42,7 +42,7 @@ ) from .sensitivity import SensitivityModel from .sensors import Accelerometer, Barometer, GnssReceiver, Gyroscope -from .simulation import Flight, MonteCarlo +from .simulation import Flight, MonteCarlo, MultivariateRejectionSampler from .stochastic import ( StochasticAirBrakes, StochasticEllipticalFins, diff --git a/rocketpy/plots/monte_carlo_plots.py b/rocketpy/plots/monte_carlo_plots.py index e20474773..2d73afa27 100644 --- a/rocketpy/plots/monte_carlo_plots.py +++ b/rocketpy/plots/monte_carlo_plots.py @@ -195,3 +195,249 @@ def all(self, keys=None): plt.tight_layout() plt.show() + + def plot_comparison(self, other_monte_carlo): + """ + Plot the histograms of the Monte Carlo simulation results. + + Parameters + ---------- + other_monte_carlo : MonteCarlo + MonteCarlo object which the current one will be compared to. + + Returns + ------- + None + """ + # TODO: understand why this validation is failing + # if not isinstance(other_monte_carlo, MonteCarlo): + # raise TypeError( + # "Argument 'other_monte_carlo' must be an MonteCarlo object!" + # ) + original_parameters_set = set(self.monte_carlo.processed_results.keys()) + other_parameters_set = set(other_monte_carlo.processed_results.keys()) + intersection_set = original_parameters_set.intersection(other_parameters_set) + + fill_colors = ["red", "blue"] + for key in intersection_set: + # Create figure with GridSpec + fig = plt.figure(figsize=(8, 8)) + gs = fig.add_gridspec(2, 1, height_ratios=[1, 3]) + + # Create subplots using gridspec + ax1 = fig.add_subplot(gs[0]) + ax2 = fig.add_subplot(gs[1]) + + # Plot boxplot + bp = ax1.boxplot( + [other_monte_carlo.results[key], self.monte_carlo.results[key]], + vert=False, + tick_labels=["Other", "Original"], + patch_artist=True, + ) + for patch, color in zip(bp["boxes"], fill_colors): + patch.set_facecolor(color) + ax1.set_title(f"Box Plot of {key}") + + # Plot histogram + ax2.hist( + self.monte_carlo.results[key], + alpha=0.5, + color="blue", + label="Original", + density=True, + ) + ax2.hist( + other_monte_carlo.results[key], + alpha=0.5, + color="red", + label="Other", + density=True, + ) + ax2.set_title(f"Histogram of {key}") + ax2.set_ylabel("Density") + + plt.tight_layout() + plt.legend() + plt.show() + + # pylint: disable=too-many-statements + def ellipses_comparison( + self, + other_monte_carlo, + image=None, + perimeter_size=3000, + xlim=(-3000, 3000), + ylim=(-3000, 3000), + save=False, + ): + """ + Plot the error ellipses for the apogee and impact points of the rocket. + + Parameters + ---------- + other_monte_carlo : MonteCarlo + MonteCarlo object which the current one will be compared to. + image : str, optional + Path to the background image, usually a map of the launch site. + perimeter_size : int, optional + Size of the perimeter to be plotted. Default is 3000. + xlim : tuple, optional + Limits of the x-axis. Default is (-3000, 3000). Values in meters. + ylim : tuple, optional + Limits of the y-axis. Default is (-3000, 3000). Values in meters. + save : bool, optional + Whether to save the plot as a file. Default is False. If True, the + plot is saved and not displayed. If False, the plot is displayed. + + Returns + ------- + None + """ + # TODO: understand why this validation is failing + # if not isinstance(other_monte_carlo, MonteCarlo): + # raise TypeError( + # "Argument 'other_monte_carlo' must be an MonteCarlo object!" + # ) + + imageio = import_optional_dependency("imageio") + + # Import background map + if image is not None: + try: + img = imageio.imread(image) + except FileNotFoundError as e: + raise FileNotFoundError( + "The image file was not found. Please check the path." + ) from e + + try: + original_apogee_x = np.array(self.monte_carlo.results["apogee_x"]) + original_apogee_y = np.array(self.monte_carlo.results["apogee_y"]) + other_apogee_x = np.array(other_monte_carlo.results["apogee_x"]) + other_apogee_y = np.array(other_monte_carlo.results["apogee_y"]) + except KeyError: + print("No apogee data found. Skipping apogee ellipses.") + original_apogee_x = np.array([]) + original_apogee_y = np.array([]) + other_apogee_x = np.array([]) + other_apogee_y = np.array([]) + try: + original_impact_x = np.array(self.monte_carlo.results["x_impact"]) + original_impact_y = np.array(self.monte_carlo.results["y_impact"]) + other_impact_x = np.array(other_monte_carlo.results["x_impact"]) + other_impact_y = np.array(other_monte_carlo.results["y_impact"]) + except KeyError: + print("No impact data found. Skipping impact ellipses.") + original_impact_x = np.array([]) + original_impact_y = np.array([]) + other_impact_x = np.array([]) + other_impact_y = np.array([]) + + if len(original_apogee_x) == 0 and len(original_impact_x) == 0: + raise ValueError("No apogee or impact data found. Cannot plot ellipses.") + + original_impact_ellipses, original_apogee_ellipses = ( + generate_monte_carlo_ellipses( + original_apogee_x, + original_apogee_y, + original_impact_x, + original_impact_y, + apogee_rgb=(0.0117647, 0.1490196, 0.9882352), + impact_rgb=(0.9882352, 0.0117647, 0.6392156), + ) + ) + + other_impact_ellipses, other_apogee_ellipses = generate_monte_carlo_ellipses( + other_apogee_x, + other_apogee_y, + other_impact_x, + other_impact_y, + apogee_rgb=(0.9882352, 0.8509803, 0.0117647), + impact_rgb=(0.0117647, 0.9882352, 0.3607843), + ) + + # Create plot figure + plt.figure(figsize=(8, 6), dpi=150) + ax = plt.subplot(111) + + # Draw ellipses and points for original monte carlo + for ell in original_impact_ellipses: + ax.add_artist(ell) + for ell in original_apogee_ellipses: + ax.add_artist(ell) + + plt.scatter(0, 0, s=30, marker="*", color="black", label="Launch Point") + plt.scatter( + original_apogee_x, + original_apogee_y, + s=5, + marker="^", + color="#0326FC", + label="Original Apogee", + ) + plt.scatter( + original_impact_x, + original_impact_y, + s=5, + marker="v", + color="#FC03A3", + label="Original Landing Point", + ) + + # Draw ellipses and points for other monte carlo + for ell in other_impact_ellipses: + ax.add_artist(ell) + for ell in other_apogee_ellipses: + ax.add_artist(ell) + + plt.scatter( + other_apogee_x, + other_apogee_y, + s=5, + marker="^", + color="#FCD903", + label="Other Apogee", + ) + plt.scatter( + other_impact_x, + other_impact_y, + s=5, + marker="v", + color="#03FC5C", + label="Other Landing Point", + ) + + plt.legend() + ax.set_title("1$\\sigma$, 2$\\sigma$ and 3$\\sigma$ Monte Carlo Ellipses") + ax.set_ylabel("North (m)") + ax.set_xlabel("East (m)") + + # Add background image to plot + # TODO: In the future, integrate with other libraries to plot the map (e.g. cartopy, ee, etc.) + # You can translate the basemap by changing dx and dy (in meters) + dx = 0 + dy = 0 + if image is not None: + plt.imshow( + img, + zorder=0, + extent=[ + -perimeter_size - dx, + perimeter_size - dx, + -perimeter_size - dy, + perimeter_size - dy, + ], + ) + + plt.axhline(0, color="black", linewidth=0.5) + plt.axvline(0, color="black", linewidth=0.5) + plt.xlim(*xlim) + plt.ylim(*ylim) + + if save: + plt.savefig( + f"{self.monte_carlo.filename}.png", bbox_inches="tight", pad_inches=0 + ) + else: + plt.show() diff --git a/rocketpy/prints/monte_carlo_prints.py b/rocketpy/prints/monte_carlo_prints.py index ad2c5c402..0f99a401f 100644 --- a/rocketpy/prints/monte_carlo_prints.py +++ b/rocketpy/prints/monte_carlo_prints.py @@ -34,3 +34,65 @@ def all(self): print( f"{key:>25} {'N/A':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15}" ) + + def print_comparison(self, other_monte_carlo): + """Print the mean and standard deviation of each parameter in the results + dictionary or of the variables passed as argument. + + Parameters + ---------- + other_monte_carlo : MonteCarlo + MonteCarlo object which the current one will be compared to. + + Returns + ------- + None + + """ + # TODO: understand why this validation is failing + # if not isinstance(other_monte_carlo, MonteCarlo): + # raise TypeError( + # "Argument 'other_monte_carlo' must be an MonteCarlo object!" + # ) + original_parameters_set = set(self.monte_carlo.processed_results.keys()) + other_parameters_set = set(other_monte_carlo.processed_results.keys()) + intersection_set = original_parameters_set.intersection(other_parameters_set) + symmetric_diff_set = original_parameters_set.symmetric_difference( + other_parameters_set + ) + print("Comparison of Monte Carlo Simulation by RocketPy") + print("Original data Source: ", self.monte_carlo.filename) + print("Comparison data Source: ", other_monte_carlo.filename) + print("Original number of simulations: ", self.monte_carlo.num_of_loaded_sims) + print( + "Comparison number of simulations: ", other_monte_carlo.num_of_loaded_sims + ) + if len(symmetric_diff_set) > 0: + print( + f"The following parameters were not in both simulations: {symmetric_diff_set}\n" + ) + print("Results: \n") + print( + f"{'Parameter':>35} {'Source':>15} {'Mean':>15} {'Median':>15} {'Std. Dev.':>15} {'95% PI Lower':>15} {'95% PI Upper':>15}" + ) + print("-" * 140) + for parameter in intersection_set: + original_value = self.monte_carlo.processed_results[parameter] + try: + print( + f"{parameter:>35} {'Original':>15} {original_value[0]:>15.3f} {original_value[1]:>15.3f} {original_value[2]:>15.3f} {original_value[3]:>15.3f} {original_value[4]:>15.3f}" + ) + except TypeError: + print( + f"{parameter:>35} {'Original':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15}" + ) + + other_value = other_monte_carlo.processed_results[parameter] + try: + print( + f"{parameter:>35} {'Other':>15} {other_value[0]:>15.3f} {other_value[1]:>15.3f} {other_value[2]:>15.3f} {other_value[3]:>15.3f} {other_value[4]:>15.3f}" + ) + except TypeError: + print( + f"{parameter:>35} {'Other':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15} {'N/A':>15}" + ) diff --git a/rocketpy/simulation/__init__.py b/rocketpy/simulation/__init__.py index b1aecdd99..6b98fdcf4 100644 --- a/rocketpy/simulation/__init__.py +++ b/rocketpy/simulation/__init__.py @@ -1,3 +1,4 @@ from .flight import Flight from .flight_data_importer import FlightDataImporter from .monte_carlo import MonteCarlo +from .multivariate_rejection_sampler import MultivariateRejectionSampler diff --git a/rocketpy/simulation/monte_carlo.py b/rocketpy/simulation/monte_carlo.py index ff86db7b3..f5f79bd17 100644 --- a/rocketpy/simulation/monte_carlo.py +++ b/rocketpy/simulation/monte_carlo.py @@ -1104,6 +1104,48 @@ def all_info(self): self.plots.ellipses() self.plots.all() + def compare_info(self, other_monte_carlo): + """ + Prints the comparison of the information of the Monte Carlo simulation + against the information of another Monte Carlo simulation. + Parameters + ---------- + other_monte_carlo : MonteCarlo + MonteCarlo object which the current one will be compared to. + Returns + ------- + None + """ + self.prints.print_comparison(other_monte_carlo) + + def compare_plots(self, other_monte_carlo): + """ + Plots the comparison of the information of the Monte Carlo simulation + against the information of another Monte Carlo simulation. + Parameters + ---------- + other_monte_carlo : MonteCarlo + MonteCarlo object which the current one will be compared to. + Returns + ------- + None + """ + self.plots.plot_comparison(other_monte_carlo) + + def compare_ellipses(self, other_monte_carlo, **kwargs): + """ + Plots the comparison of the ellipses of the Monte Carlo simulation + against the ellipses of another Monte Carlo simulation. + Parameters + ---------- + other_monte_carlo : MonteCarlo + MonteCarlo object which the current one will be compared to. + Returns + ------- + None + """ + self.plots.ellipses_comparison(other_monte_carlo, **kwargs) + def _import_multiprocess(): """Import the necessary modules and submodules for the @@ -1182,6 +1224,7 @@ def print_update_status(self, sim_idx): ------- None """ + average_time = (time() - self.start_time) / (self.count - self.initial_count) estimated_time = int((self.n_simulations - self.count) * average_time) @@ -1220,6 +1263,7 @@ def reprint(msg, end="\n", flush=True): ------- None """ + padding = "" if len(msg) < _SimMonitor._last_print_len: diff --git a/rocketpy/simulation/multivariate_rejection_sampler.py b/rocketpy/simulation/multivariate_rejection_sampler.py new file mode 100644 index 000000000..278b28f7a --- /dev/null +++ b/rocketpy/simulation/multivariate_rejection_sampler.py @@ -0,0 +1,292 @@ +""" +Multivariate Rejection Sampling Module for RocketPy + +Notes +----- +This module is still under active development, and some features or attributes may +change in future versions. Users are encouraged to check for updates and read the +latest documentation. +""" + +import json +from dataclasses import dataclass +from pathlib import Path +from random import random +from typing import Union + +from rocketpy._encoders import RocketPyEncoder +from rocketpy.tools import flatten_dict + + +@dataclass +# TODO: replace Union by "|" once python 3.9 is no longer supported +# pylint: disable=unsupported-binary-operation +class SampleInformation: + """Sample information used in the MRS + + Attributes + ---------- + inputs_json : dict or None + Dictionary containing the original information of the inputs file. + flatted_inputs_json : dict or None + Dictionary containing the information of the inputs file in a + flat format to allow re-sampling based on nested data. + outputs_json : dict or None + Dictionary containing the original information of the outputs file. + probability_ratio : float or None + Probability ratio of the new proposed distribution and the previous + distribution evaluated at the unit sample data. + acceptance_probability : float or None + The final acceptance probability that the given sample will be + re-sampled. It is given by the ratio of the probability ratio + and the supremum of all probability ratios. + """ + + inputs_json: Union[dict, None] = None + flatted_inputs_json: Union[dict, None] = None + outputs_json: Union[dict, None] = None + probability_ratio: Union[float, None] = None + acceptance_probability: Union[float, None] = None + + +class MultivariateRejectionSampler: + """Class that performs Multivariate Rejection Sampling (MRS) from MonteCarlo + results. + + The class currently assumes that all input variables are sampled independently + when performing the Monte Carlo Simulation. + + Attributes + ---------- + """ + + def __init__( + self, + monte_carlo_filepath, + mrs_filepath, + ): + """Initializes Multivariate Rejection Sampler (MRS) class + + Parameters + ---------- + monte_carlo_filepath : str + Filepath prefixes to the files created from a MonteCarlo simulation + results and used as input for resampling. + mrs_filepath : str + Filepath prefix to MRS obtained samples. The files created follow the same + structure as those created by the MonteCarlo class but now containing the + selected sub-samples. + + Returns + ------- + None + """ + self.monte_carlo_filepath = Path(monte_carlo_filepath) + self.mrs_filepath = Path(mrs_filepath) + self.distribution_dict = None + self.original_sample_size = 0 + self.sup_ratio = 1 + self.expected_sample_size = None + self.final_sample_size = None + self.input_variables_names = set() + self.output_variables_names = set() + self.all_sample_list = [] + self.accepted_sample_list = [] + self.__setup_input() + self.__load_output() + + # pylint: disable=consider-using-with + def __setup_input(self): + """Loads input information from monte carlo in a SampleInformation + object + """ + input_filename = self.monte_carlo_filepath.with_suffix(".inputs.txt") + + try: + input_file = open(input_filename, "r+", encoding="utf-8") + except FileNotFoundError as e: + raise FileNotFoundError( + f"Input file from monte carlo {input_filename} not found!" + ) from e + + try: + for line in input_file.readlines(): + sample_info = SampleInformation() + line_json = json.loads(line) + flatted_line_json = flatten_dict(line_json) + sample_info.inputs_json = line_json + sample_info.flatted_inputs_json = flatted_line_json + self.all_sample_list.append(sample_info) + + # sets and validates input variables names + if not self.input_variables_names: + self.input_variables_names = set(flatted_line_json.keys()) + self.original_sample_size += 1 + except Exception as e: + raise ValueError( + "An error occurred while reading " + f"the monte carlo input file {input_filename}!" + ) from e + + finally: + input_file.close() + + # pylint: disable=consider-using-with + def __load_output(self): + """Loads output information from monte carlo in a SampleInformation + object. + """ + output_filename = self.monte_carlo_filepath.with_suffix(".outputs.txt") + sample_size_output = 0 # sanity check + + try: + output_file = open(output_filename, "r+", encoding="utf-8") + except FileNotFoundError as e: + raise FileNotFoundError( + f"Output file from monte carlo {output_filename} not found!" + ) from e + + try: + for line in output_file.readlines(): + if sample_size_output > self.original_sample_size: + raise ValueError( + "Monte carlo output has more lines than the input file!" + ) + line_json = json.loads(line) + self.all_sample_list[sample_size_output].outputs_json = line_json + sample_size_output += 1 + except Exception as e: + raise ValueError( + "An error occurred while reading " + f"the monte carlo output file {output_filename}!" + ) from e + + finally: + output_file.close() + + if self.original_sample_size > sample_size_output: + raise ValueError( + "Monte carlo output file has fewer lines than the input file!" + ) + + def __validate_distribution_dict(self, distribution_dict): + """Checks that the variables passed in the distribution dictionary were + in the input file. + + """ + input_variables_names = set(distribution_dict.keys()) + for variable in input_variables_names: + if variable not in self.input_variables_names: + raise ValueError( + f"Variable key {variable} from 'distribution_dict' " + "not found in input file!" + ) + + # pylint: disable=consider-using-with + def sample(self, distribution_dict): + """Performs rejection sampling and saves data + + Parameters + ---------- + distribution : dict + Dictionary whose keys contain the name whose distribution changed. + The values are tuples or lists with two entries. The first entry is + a probability density (mass) function for the old distribution, + while the second entry is the probability density function for the + new distribution. + + Returns + ------- + None + """ + + self.__validate_distribution_dict(distribution_dict) + + mrs_input_file = open( + self.mrs_filepath.with_suffix(".inputs.txt"), "w+", encoding="utf-8" + ) + mrs_output_file = open( + self.mrs_filepath.with_suffix(".outputs.txt"), "w+", encoding="utf-8" + ) + mrs_error_file = open( + self.mrs_filepath.with_suffix(".errors.txt"), "w+", encoding="utf-8" + ) + + self.__setup_probabilities(distribution_dict) + + try: + for sample in self.all_sample_list: + if random() < sample.acceptance_probability: + mrs_input_file.write( + json.dumps(sample.inputs_json, cls=RocketPyEncoder) + "\n" + ) + mrs_output_file.write( + json.dumps(sample.outputs_json, cls=RocketPyEncoder) + "\n" + ) + except Exception as e: + raise ValueError( + "An error occurred while writing the selected sample to the " + "output files" + ) from e + + finally: + mrs_input_file.close() + mrs_output_file.close() + mrs_error_file.close() + + def __setup_probabilities(self, distribution_dict): + """Computes the probability ratio, probability ratio supremum and acceptance + probability for each sample. + + Parameters + ---------- + distribution : dict + Dictionary whose keys contain the name whose distribution changed. The values + are tuples or lists with two entries. The first entry is a probability + density (mass) function for the old distribution, while the second entry + is the probability density function for the new distribution. + """ + self.sup_ratio = 1 + for sample in self.all_sample_list: + sample.probability_ratio = self.__compute_probability_ratio( + sample, distribution_dict + ) + self.sup_ratio = max(self.sup_ratio, sample.probability_ratio) + + for sample in self.all_sample_list: + sample.acceptance_probability = sample.probability_ratio / self.sup_ratio + self.expected_sample_size = self.original_sample_size // self.sup_ratio + + def __compute_probability_ratio(self, sample, distribution_dict): + """Computes the ratio of the new probability to the old probability + for the given sample + + Parameters + ---------- + sample: SampleInformation + Sample information used to extract the values to evaluate the + distributions pdf. + distribution : dict + Dictionary whose keys contain the name whose distribution changed. The values + are tuples or lists with two entries. The first entry is a probability + density (mass) function for the old distribution, while the second entry + is the probability density function for the new distribution. + + Raises + ------ + ValueError + Raises exception if an error occurs when computing the ratio. + """ + probability_ratio = 1 + try: + for variable in distribution_dict.keys(): + value = sample.flatted_inputs_json[variable] + old_pdf = distribution_dict[variable][0] + new_pdf = distribution_dict[variable][1] + probability_ratio *= new_pdf(value) / old_pdf(value) + except Exception as e: + raise ValueError( + "An error occurred while evaluating the probability ratio" + ) from e + + return probability_ratio diff --git a/rocketpy/stochastic/stochastic_aero_surfaces.py b/rocketpy/stochastic/stochastic_aero_surfaces.py index 5dda716bb..5e3750f48 100644 --- a/rocketpy/stochastic/stochastic_aero_surfaces.py +++ b/rocketpy/stochastic/stochastic_aero_surfaces.py @@ -4,12 +4,12 @@ """ from rocketpy.rocket.aero_surface import ( + AirBrakes, EllipticalFins, NoseCone, RailButtons, Tail, TrapezoidalFins, - AirBrakes, ) from .stochastic_model import StochasticModel diff --git a/rocketpy/tools.py b/rocketpy/tools.py index 91428d50b..692d5e224 100644 --- a/rocketpy/tools.py +++ b/rocketpy/tools.py @@ -569,26 +569,48 @@ def __generate_ellipse_points(ellipse, resolution: int): return np.array(points) -def flatten_dict(x): - # Auxiliary function that flattens dictionary - # this is used mainly in the load_monte_carlo_data function - new_dict = {} - for key, value in x.items(): +def flatten_dict(original_dict): + """Flatten a dictionary for easy handling of nested variables + + This function is mainly used for handling data in sensitivity analysis + and in the MRS. + + Parameters + ---------- + original_dict : dict + A dictionary possibly containing nested variables. This means that + a key might contain another dictionary inside of it. + + Returns + ------- + flatted_dict : dict + The flatted dictionary which, ideally, should not contain nested + variables. All nested information should be available directly in + the first level (access by key). Variables that were available + inside the first level retain their original key name. Variables + that were nested are created by appending the name of the outer + key used to access it concatenated with a '_' and the key name + of the variable. + """ + flatted_dict = {} + for key, value in original_dict.items(): # the nested dictionary is inside a list - if isinstance(x[key], list): - # sometimes the object inside the list is another list - # we must skip these cases - if isinstance(value[0], dict): - inner_dict = flatten_dict(value[0]) - inner_dict = { - key + "_" + inner_key: inner_value - for inner_key, inner_value in inner_dict.items() - } - new_dict.update(inner_dict) + if isinstance(original_dict[key], list): + for inner_item in value: + if isinstance(inner_item, dict): + inner_dict = flatten_dict(inner_item) + sep_str = "_" + if "name" in inner_dict: + sep_str = "_" + inner_dict["name"] + "_" + inner_dict = { + key + sep_str + inner_key: inner_value + for inner_key, inner_value in inner_dict.items() + } + flatted_dict.update(inner_dict) else: - new_dict.update({key: value}) + flatted_dict.update({key: value}) - return new_dict + return flatted_dict def load_monte_carlo_data( diff --git a/tests/integration/test_monte_carlo.py b/tests/integration/test_monte_carlo.py index 48e47a6e2..5da5066a2 100644 --- a/tests/integration/test_monte_carlo.py +++ b/tests/integration/test_monte_carlo.py @@ -87,12 +87,21 @@ def test_monte_carlo_set_outputs_log(monte_carlo_calisto): def test_monte_carlo_prints(monte_carlo_calisto): """Tests the prints methods of the MonteCarlo class.""" monte_carlo_calisto.info() + monte_carlo_calisto.compare_info(monte_carlo_calisto) @patch("matplotlib.pyplot.show") # pylint: disable=unused-argument def test_monte_carlo_plots(mock_show, monte_carlo_calisto_pre_loaded): """Tests the plots methods of the MonteCarlo class.""" assert monte_carlo_calisto_pre_loaded.all_info() is None + assert ( + monte_carlo_calisto_pre_loaded.compare_plots(monte_carlo_calisto_pre_loaded) + is None + ) + assert ( + monte_carlo_calisto_pre_loaded.compare_ellipses(monte_carlo_calisto_pre_loaded) + is None + ) def test_monte_carlo_export_ellipses_to_kml(monte_carlo_calisto_pre_loaded): diff --git a/tests/integration/test_multivariate_rejection_sampler.py b/tests/integration/test_multivariate_rejection_sampler.py new file mode 100644 index 000000000..ddbe3eb2e --- /dev/null +++ b/tests/integration/test_multivariate_rejection_sampler.py @@ -0,0 +1,45 @@ +import os + +import pytest +from scipy.stats import norm + +from rocketpy import MultivariateRejectionSampler + + +@pytest.mark.parametrize( + "monte_carlo_filepath, distribution_dict", + [ + ( + "tests/fixtures/monte_carlo/example", + {"mass": (norm(15.5, 1).pdf, norm(15.2, 1).pdf)}, + ), + ( + "tests/fixtures/monte_carlo/example", + {"motors_total_impulse": (norm(6000, 1000).pdf, norm(6500, 1000).pdf)}, + ), + ( + "tests/fixtures/monte_carlo/example", + { + "parachutes_calisto_drogue_chute_lag": ( + norm(1.5, 0.25).pdf, + norm(1.2, 0.25).pdf, + ) + }, + ), + ], +) +def test_mrs_sample_integration(monte_carlo_filepath, distribution_dict): + """Tests the set_inputs_log method of the MonteCarlo class. + + Parameters + ---------- + monte_carlo_calisto : MonteCarlo + The MonteCarlo object, this is a pytest fixture. + """ + mrs_filepath = "mrs" + mrs = MultivariateRejectionSampler(monte_carlo_filepath, mrs_filepath) + mrs.sample(distribution_dict) + + os.remove("mrs.inputs.txt") + os.remove("mrs.outputs.txt") + os.remove("mrs.errors.txt") diff --git a/tests/unit/test_multivariate_rejection_sampler.py b/tests/unit/test_multivariate_rejection_sampler.py new file mode 100644 index 000000000..af58b8fef --- /dev/null +++ b/tests/unit/test_multivariate_rejection_sampler.py @@ -0,0 +1,113 @@ +import json +import os + +import pytest +from scipy.stats import norm + +from rocketpy import MultivariateRejectionSampler +from rocketpy._encoders import RocketPyEncoder + + +# pylint: disable=too-many-statements +def test_mrs_initialization(): + """Tests if the MultivariateRejectionSampler initialization opens input and output + files correctly, and if it raises errors correctly when the files are problematic. + """ + mrs_prefix = "mrs" + + # Tests if the input and output files opens correctly when the input is valid + valid_mc_filepath_prefix = "valid_mc" + valid_inputs = [ + {"a": 1, "b": 2, "c": [{"d": 1}]}, + {"a": 3, "b": 4, "c": [{"d": 1}]}, + ] + valid_outputs = [ + {"e": 10, "f": 20}, + {"e": 30, "f": 40}, + ] + with open(valid_mc_filepath_prefix + ".inputs.txt", "w+") as file: + for json_input in valid_inputs: + file.write(json.dumps(json_input, cls=RocketPyEncoder) + "\n") + with open(valid_mc_filepath_prefix + ".outputs.txt", "w+") as file: + for json_output in valid_outputs: + file.write(json.dumps(json_output, cls=RocketPyEncoder) + "\n") + MultivariateRejectionSampler(valid_mc_filepath_prefix, mrs_prefix) + + # tests if it raises an error when the file does not exist + with pytest.raises(FileNotFoundError): + MultivariateRejectionSampler("non_existent_mc_prefix", mrs_prefix) + + # tests if it raises an error when the input and output file contains + # different number of samples + invalid_mc_filepath_prefix = "invalid_mc" + invalid_inputs = [ + {"a": 1, "b": 2}, + {"a": 3, "b": 4}, + ] + invalid_outputs = [{"c": 10, "d": 40}] + with open(invalid_mc_filepath_prefix + ".inputs.txt", "w+") as file: + for json_input in invalid_inputs: + file.write(json.dumps(json_input, cls=RocketPyEncoder) + "\n") + with open(invalid_mc_filepath_prefix + ".outputs.txt", "w+") as file: + for json_output in invalid_outputs: + file.write(json.dumps(json_output, cls=RocketPyEncoder) + "\n") + with pytest.raises(ValueError): + MultivariateRejectionSampler(invalid_mc_filepath_prefix, mrs_prefix) + + os.remove(valid_mc_filepath_prefix + ".inputs.txt") + os.remove(valid_mc_filepath_prefix + ".outputs.txt") + os.remove(invalid_mc_filepath_prefix + ".inputs.txt") + os.remove(invalid_mc_filepath_prefix + ".outputs.txt") + + +def test_mrs_sample(): + """Tests if the MultivariateRejectionSampler samples correctly and raises errors + when a non-existing variable is used in the distribution dict. + """ + mrs_prefix = "mrs" + + # Tests if the input and output files opens correctly when the input is valid + mc_filepath_prefix = "valid_mc" + mc_inputs = [ + {"a": 0}, + {"a": 0.1}, + {"a": -0.1}, + {"a": 0.2}, + {"a": -0.2}, + {"a": 1}, + {"a": 1.1}, + {"a": -1.1}, + {"a": 1.2}, + {"a": -1.2}, + ] + mc_outputs = [ + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + {"b": 10}, + ] + with open(mc_filepath_prefix + ".inputs.txt", "w+") as file: + for json_input in mc_inputs: + file.write(json.dumps(json_input, cls=RocketPyEncoder) + "\n") + with open(mc_filepath_prefix + ".outputs.txt", "w+") as file: + for json_output in mc_outputs: + file.write(json.dumps(json_output, cls=RocketPyEncoder) + "\n") + mrs = MultivariateRejectionSampler(mc_filepath_prefix, mrs_prefix) + + invalid_distribution_dict = {"invalid_name": (norm(0, 1).pdf, norm(0, 1).pdf)} + with pytest.raises(ValueError): + mrs.sample(invalid_distribution_dict) + valid_distribution_dict = {"a": (norm(0, 1).pdf, norm(0, 1).pdf)} + mrs.sample(valid_distribution_dict) + + os.remove(mc_filepath_prefix + ".inputs.txt") + os.remove(mc_filepath_prefix + ".outputs.txt") + os.remove(mrs_prefix + ".inputs.txt") + os.remove(mrs_prefix + ".outputs.txt") + os.remove(mrs_prefix + ".errors.txt")