update code requirements, fix train.py

[jorgeorpinel]

From treeverse/dvc.org#762 (comment)

Req's are pretty old:

https://github.com/iterative/example-versioning/blob/ac7473d8fb9453fa3f9634941d6aa7ac40979a5f/requirements.txt#L1-L3

(but work. Last tested on Python 3.7)

UPDATE: Actually it's tensorflow==1.13.1 now, see #3 (comment).

---

Update https://dvc.org/doc/tutorials/versioning accordingly if this code changes.

[jorgeorpinel]

@shcheklein said (in treeverse/dvc.org#762 (comment)):

I think it's bette to review it and update either using PyTorch or the latest release TensorFlow + Keras.

[casperdcl]

Can do in the next couple of weeks if nobody else does

[shcheklein]

@casperdcl that would be great! Please feel free to assign it to yourself when you start reviewing it.

[jorgeorpinel]

p.s. sorry I was mistaken actually its tensorflow==1.13.1 now (1.11.0 is no longer available with pip) and also test.py is broken with:

Traceback (most recent call last):
  File "train.py", line 123, in <module>
    train_top_model()
  File "train.py", line 118, in train_top_model
    json.dump(history.history, open("metrics.json", 'w'))
...
  File "/.../lib/python3.7/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type float32 is not JSON serializable

[jorgeorpinel]

Still interested given this ^ @casperdcl?

[casperdcl]

yes easy fix just don't have much time over the next week or so