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Matrix Factorisation class packaging methods for factorisation of explicit & implicit data matrices using Gradient Descent, SGD and ALS

imports I don't understand why you omitted these lines. I added them back. They alter the meaning of the submitted source code, and make it reviewable. ...
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Matrix Factorisation class packaging methods for factorisation of explicit & implicit data matrices using Gradient Descent, SGD and ALS

It is great that you used docstrings and comments. Here are some minor suggestions, purely for coding style. There are many long lines of code, and many can be shortened by moving the end-of-line ...
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Applying Minimum Image Convention in Python

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Jake's user avatar
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