[WIP] Implement position-dependent weighting to fastText#2905

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Witiko wants to merge 7 commits intopiskvorky:developfrom Witiko:position-dependent-weighting

+1,304-28

Commits on Aug 8, 2020

Add Jupyter notebook for position-dependent weighting with fastText CBOW
Witiko
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Commits on Sep 14, 2020

Commits on Nov 9, 2020

Average accumulated position vector weight updates
Witiko
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Commits on Nov 15, 2020

Initialize position-dependent weights with uniform distribution
Witiko
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Commits on Nov 30, 2020

Fix initialization for position_dependent_vector_size < vector_size
Witiko
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