Add "If" operation to the whitelist

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[alicialitrtwe]

@googlebot I signed it!

[andrefaraujo]

Thanks! See the comment I left in the code.

Another questions: 1) just out of curiosity, what kind of models are you using that require this change? 2) I was able to find the PlaceholderWithDefault op, but couldn't find the "If" one. Do you know if it's related to tf.cond?

[andrefaraujo]

Oh, I think I know why you're adding the If op -- likely related to Keras batch-norm. You can disable it and avoid the error with the If op by doing something like this:

g = tf.Graph()
with g.as_default():
  tf.keras.backend.set_learning_phase(0) # Disable BN learning.
  x = tf.keras.Input([None, None, 3], name='input_image')
  model = tf.keras.applications.InceptionV3(input_tensor=x)

[andrefaraujo]

Closing due to lack of activity, but please feel free to reopen :)