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refactor: load eq_param_index of BundleSolvers correctly #212

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refactor: load eq_param_index of BundleSolvers correctly #212

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b5d457d
refactor: load eq_param_index of BundleSolvers correctly
sathvikbhagavan Dec 31, 2023
b90ab42
fix: use self.eq_param_index inside _diff_eqs_wrapper
sathvikbhagavan Dec 31, 2023
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2 changes: 1 addition & 1 deletion neurodiffeq/solvers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1357,7 +1357,7 @@ def __init__(self, ode_system, conditions, t_min, t_max,

def _diff_eqs_wrapper(*variables):
funcs_and_coords = variables[:N_FUNCTIONS + N_COORDS]
eq_params = tuple(variables[idx] for idx in eq_param_index)
eq_params = tuple(variables[idx] for idx in self.eq_param_index)
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@shuheng-liu shuheng-liu Jan 2, 2024 •
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Is there a particular reason we want to use self.eq_param_index instead of eq_param_index here? Both ways should have the same effect most of the time, but I don't want self.diff_eqs to be a closure that depends on self. This would make certain operations complicated, such as recreating a solver

solver1 = BundleSolver1D(..., eq_param_index1)
solver2 = BundleSolver1D(..., eq_param_index2)
solver2.diff_eqs = solver1.diff_eqs

If eq_param_index1 and eq_param_index2 are different, the above won't work, as solver1.diff_eqs will always depend on solver1.

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@sathvikbhagavan sathvikbhagavan Jan 2, 2024

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hmm.. my motivation to use self.eq_param_index was to use this internal variable when loading a saved solver as otherwise we have to recompute eq_param_index again and pass it in the constructor.

return ode_system(*funcs_and_coords, *eq_params)

super(BundleSolver1D, self).__init__(
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4 changes: 3 additions & 1 deletion neurodiffeq/solvers_utils.py
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Expand Up @@ -530,7 +530,9 @@ def load(cls,
t_min=t_min,
t_max=t_max,
theta_min=tuple(load_dict['solver'].r_min[1:]),
theta_max=tuple(load_dict['solver'].r_max[1:]))
theta_max=tuple(load_dict['solver'].r_max[1:]),
eq_param_index=load_dict['solver'].eq_param_index
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@shuheng-liu shuheng-liu Jan 2, 2024

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At a certain point we should consider refactoring the solver_utils package. A lot of the code seems to be a little ad-hoc. They are fine for now.

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@sathvikbhagavan sathvikbhagavan Jan 2, 2024

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Yes, I think we are due to think about refactoring and redesigning these pieces as they are pretty hard coded. I also have some thoughts on how parameters are saved - https://github.com/NeuroDiffGym/neurodiffeq/blob/master/neurodiffeq/solvers_utils.py#L99 which ties back to how parameters are used inside the function of the differential equation. I will open up an issue on this and we can discuss these things in detail.

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if best_nets != None:
solver.best_nets = best_nets
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