add non-stochastic inference mode to quantizers

[jecorona97]

Currently, models with stochastic quantizers peform stochastic operations even in inference mode. This mechanism prevents this and uses the non-stochastic version of the quantizer if in inference mode.

[zhuangh]

test failed? https://travis-ci.org/github/google/qkeras/builds/694845721

[zhuangh]

Hey @jecorona97

The error is "referenced before assignment"

E         tensorflow.python.autograph.impl.api.StagingError: in user code:
E         
E             /home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/qkeras/qnormalization.py:204 call  *
E                 training = self._get_training_value(training)
E         
E             UnboundLocalError: local variable 'training' referenced before assignment

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[zhuangh]

Hi Jose,

• Why are there so many commits from the history in this PR?
• I see you use your personal gmail from backend for recent commits (instead of your previous corp mail) so googlebot asked for the CLA.