Delete intermediate tensors in BinaryEncoder forward

[dereklhansen]

This fixes an out-of-memory issue in the BinaryEncoder forward when training on GPU

[codecov]

Codecov Report

Merging #440 (5257659) into master (957d5ce) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #440   +/-   ##
=======================================
  Coverage   93.65%   93.66%           
=======================================
  Files          20       20           
  Lines        2932     2934    +2     
=======================================
+ Hits         2746     2748    +2     
  Misses        186      186           

Flag	Coverage Δ
unittests	93.66% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
bliss/models/binary.py	99.14% <100.00%> (+0.01%)	⬆️

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