Lionel lig 5887 make arguments to masked pooling non optional

[liopeer]

Changes

• makes num_cls argument to pool_masked non-optional
• removes tests for auto-inference of num_cls

Reason for the Change

• bad heuristics in inference of num_cls, better to make it explicit
• multiple calls with different masks could return tensors of differing shapes (impossible to stack/concatenate)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.24%. Comparing base (f6ad8c7) to head (b8f0335).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1776      +/-   ##
==========================================
- Coverage   85.25%   85.24%   -0.01%     
==========================================
  Files         163      163              
  Lines        6834     6832       -2     
==========================================
- Hits         5826     5824       -2     
  Misses       1008     1008              

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