Cannot feed value of shape (75970, 768) for Tensor 'LearningRate:0', which has shape '()'

[lefnire]

Python 3.7
Tensorflow 1.14 (also tried 1.13.1, 1.13.0rc1. 1.15 gives error ModuleNotFoundError: No module named 'tensorflow_core.keras')

from cvae import cvae
x = ... # shape [,768]
embedder = cvae.CompressionVAE(X)
embedder.train()

Session set up.
Trying to restore saved checkpoints from /app/temp ... No checkpoint found.
No model found to restore. Initialising new model.
Starting queues.
Reader threads started.
Storing checkpoint to /app/temp ... Done.
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask_cors/extension.py", line 161, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask_cors/extension.py", line 161, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/local/lib/python3.7/site-packages/flask_jwt/__init__.py", line 177, in decorator
    return fn(*args, **kwargs)
  File "/app/jwtauthtest/views.py", line 427, in get_books
    books = ml.resources(entries, logger=app.logger)
  File "/app/jwtauthtest/ml.py", line 523, in resources
    clusterer.fit(all_db)
  File "/app/jwtauthtest/autoencoder.py", line 95, in fit
    self.ae.train(x)
  File "/usr/local/lib/python3.7/site-packages/cvae/cvae.py", line 489, in train
    self.lr_placeholder: lr})
  File "/usr/local/lib/python3.7/site-packages/tensorflow/python/client/session.py", line 929, in run
    run_metadata_ptr)
  File "/usr/local/lib/python3.7/site-packages/tensorflow/python/client/session.py", line 1128, in _run
    str(subfeed_t.get_shape())))
ValueError: Cannot feed value of shape (75970, 768) for Tensor 'LearningRate:0', which has shape '()'