update the tensorflow deps to 2.1.0

[pyu10055]

Update the tensorflow imports to specifically import compat.v2, since in g3 by default it imports compat.v1

Using latest TF 2.1.0 official release

also fixed #2582

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This change is 

[dsmilkov]

Reviewed 16 of 16 files at r1.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @dsmilkov and @pyu10055)

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tfjs-converter/python/requirements.txt, line 4 at r1 (raw file):

numpy>=1.16.4
six>=1.12.0
tensorflow==2.1.0rc2

can this be relaxed to tensorflow>=2.0.0 ?

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tfjs-converter/python/tensorflowjs/converters/tf_saved_model_conversion_v2_test.py, line 90 at r1 (raw file):

    graph = tf.Graph()
    with graph.as_default():
      x = tf.compat.v1.placeholder('float32', [2, 2])

is tf.compat.v1 going away in 2.1.0 final (not the RC version)?

[pyu10055]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @dsmilkov)

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tfjs-converter/python/requirements.txt, line 4 at r1 (raw file):

Previously, dsmilkov (Daniel Smilkov) wrote…

can this be relaxed to tensorflow>=2.0.0 ?

unfortunately there is a bug on 2.0.0 with keras layers, it failed to save out h5 format for loaded models.

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tfjs-converter/python/tensorflowjs/converters/tf_saved_model_conversion_v2_test.py, line 90 at r1 (raw file):

Previously, dsmilkov (Daniel Smilkov) wrote…

is tf.compat.v1 going away in 2.1.0 final (not the RC version)?

it would not