This repository contains Jupyter notebooks used for teaching 'Text-mining with Python: Named Entity Recognition (NER)', a course in the Cambridge Digital Humanities (CDH) Cultural Heritage Data School 2020. This event was the first CDH Data School to be delivered completely online following the coronavirus pandemic.
The notebooks are designed to be worked on as self-paced materials in a 'flipped classroom' approach. They are also written as stand-alone notebooks for anyone to follow and use as they wish.
The aim is to teach basic NER techniques to a wide audience, and the material suitable both for those people who:
- Have some background in Python or
- Just want to learn about the concepts without programming.
Using the example of some nineteenth-century letters of science, these notebooks introduce how to:
- Automatically recognise and visualise named entities using machine learning;
- Train machine learning models for improving results;
- Link named entities to existing knowledge bases or authorities.
For non-coders, I recommend you start with the notebook 2-named-entity-recognition-of-henslow-data and skip over the notebook 4-updating-the-model-on-henslow-data.
If you’re a Python beginner, I recommend that you work through the first notebook 0-introduction-to-python-and-text.ipynb. It contains a brief refresher of the basic Python you need to understand the NER examples, but I don’t expect it will be enough to teach you Python from scratch.
For everyone else, I recommend you start with notebook 1-basic-text-mining-concepts.ipynb and work through the rest in order. 4-updating-the-model-on-henslow-data.ipynb is the most advanced Python in the course and is intended as a deep dive for those with a further interest in working with spaCy. If you don’t understand everything here yet, feel free to run through it quickly or skip it.
Originally, these notebooks were delivered using data from the Darwin Correspondence Project, which we had permission to use within the context of the Data School. Unfortunately, the CC-BY-NC-ND license under which the letters are licensed from Cambridge University Press allows for distribution of the letters, but not the creation of derivatives, which meant that the notebooks could not be published. I have re-written the notebooks using data from the Henslow Correspondence Project (HCP) instead, which is licensed more permissively with CC-BY-NC.
The HCP letters were written during the period of British imperialism, therefore some of the correspondence contains
content we now find offensive, for example, letters_138.xml contains a racist description. These notebooks do not
contain or discuss any of this material, but please be aware you may come across it if you browse through the letters
independently.
The notebooks should run on any of the following versions of Python:
They are designed to be run as a teaching aid, not as a serious text analysis tool.
The easiest way to run the Jupyter notebooks in this repository is to click on the "launch binder" button above. This will open in the same tab. To open in a new tab, right-click the button and choose 'Open in a new tab' or similar, depending on your browser. Binder will launch a virtual environment in your browser where you can open and run the notebooks without installing anything.
Please note:
- Some cells in the notebooks may use more memory than Binder allows, causing the notebook's kernel to crash. After it has restarted, try modifying the code to process fewer documents.
- Binder may shut down after about 10 minutes of inactivity e.g. if you don't keep the window open. You can simply open a new Binder to start again.
- Binder will not save any changes you make to the notebooks. To save changes you need to download the notebooks and run them on your own computer.
Please note these instructions are suitable if you already have Python installed in some way. If you have never installed Python yourself on your computer before, I recommend this guide: Python 3 Installation & Setup Guide.
Click the green "Code" button to the top-right of this page.
If you have never used git version control before I recommend you simply download the notebooks with the
"Download ZIP" option. In most operating systems this will automatically unzip it back into individual files. Move
the folder to somewhere you want to keep it, such as "My Documents".
If you have used git before, then you can clone the repo with this command:
git clone https://github.com/mchesterkadwell/named-entity-recognition.git
If you installed Python from python.org (or from the Windows Store) follow these instructions.
If you are using PyCharm or another IDE with which you are already familiar, of course, do what you normally do instead to create a virtual environment and install dependencies.
Open a Terminal and change directory into the notebooks folder by typing something like this:
cd path/to/notebooks
where path/to/notebooks is the filepath to wherever you’ve put the notebooks folder.
Then create a new virtual environment:
python3 -m venv env
Activate the virtual environment:
source env/bin/activate
Then install all the dependencies:
pip install -r requirements.txt
This should initiate a big list of downloads and will take a while to finish. Please be patient.
Finally, to start the notebook server type:
jupyter notebook
When you are finished with the notebook, press ctrl+c to stop the notebook server. Then type:
deactivate
You can close the Terminal window.
Open a terminal and type something like this (pressing return between each line):
cd path/to/notebooks
source env/bin/activate
jupyter notebook
When you are finished with the notebook, press ctrl+c to stop the notebook server. Then type:
deactivate
You can close the Terminal window.
Open a Command Prompt and change directory into the notebooks folder by typing something like this:
cd path\to\notebooks
where path\to\notebooks is the filepath to wherever you’ve put the notebooks folder.
Then create a new virtual environment:
python -m venv env
Activate the virtual environment:
env\Scripts\activate.bat
Then install all the dependencies:
pip install -r requirements.txt
This should initiate a big list of downloads and will take a while to finish. Please be patient.
Finally, to start the notebook server type:
jupyter notebook
When you are finished with the notebook, press ctrl+c to stop the notebook server. Then type:
deactivate
You can close the Command Prompt window.
Open a Command Prompt and type something like this (pressing return between each line):
cd path\to\notebooks
env\Scripts\activate.bat
jupyter notebook
When you are finished with the notebook, press ctrl+c to stop the notebook server. Then type:
deactivate
You can close the Command Prompt window.
If you installed Python with Anaconda from Anaconda.com follow these instructions.
Open Anaconda Navigator. In Anaconda Navigator > Environments click on the ‘Create’ button in the bottom left of the Environments list.
Type a name e.g. 'data-school-ner', make sure that 'Python' is checked and under the dropdown pick '3.7'. Make sure that 'R' is left unchecked.
Then click the ‘Create’ button.
It will take a few seconds to set up...
Then in Anaconda Navigator > Environments make sure you have selected your new environment.
On the right of the environment name is a small green play arrow. Click on it and pick ‘Open Terminal’ from the dropdown.
In the Terminal that opens type the following, and press return:
conda install pip
If you do not already have pip installed, it will install it. Otherwise it will give a message:
# All requested packages already installed.
Then change directory to wherever you saved the notebooks folder by typing something like:
cd \path\to\notebooks
where path\to\notebooks is the filepath to wherever you’ve put the notebooks folder.
If you are on Mac or Linux, make sure to use forward slashes in the filepath instead e.g. path/to/notebooks
Then install all the dependencies by typing:
pip install -r requirements.txt
This should initiate a big list of downloads and will take a while to finish. Please be patient.
Finally, to launch the Jupyter notebook server type:
jupyter notebook
It should automatically open a browser window with the notebook listing in it, a bit like this:
If not, you can copy and paste one of the URLs in the Terminal window into your browser e.g. http://localhost:8888/?token=ddb27d2a1a6cb29a3483c24d6ff9f7263eb9676f02d71075 (This example will not work on your machine, as the token is unique every time!)
When you are finished with the notebook, press ctrl+c to stop the notebook server.
You can close the Terminal window.
Next time you want to start the notebook server:
In Anaconda Navigator > Environments make sure you have selected your new environment e.g. 'data-school-ner'.
On the right of the environment name is a small green play arrow. Click on it and pick ‘Open Terminal’ from the dropdown.
To launch the Jupyter notebook server type:
jupyter notebook
When you are finished with the notebook, press ctrl+c to stop the notebook server. You can close the Terminal window.