How do I create padded batches in Tensorflow for tf.train.SequenceExample data using the DataSet API?

Question

For training an LSTM model in Tensorflow, I have structured my data into a tf.train.SequenceExample format and stored it i

Answer 1

Beware of not passing a tuple of tuples. That gives a very vague error of "cannot convert value None to type Nonetype".

So correct: padded_shapes = ([None, None], [None])

INCORRECT: padded_shapes = ((None, None), (None))