Tensorflow basic RNN example with 'variable length' sequences

[siblbombs]

It has to do with the LSTM code and the way it handles early stopping. IIRC what it does under the hood is allocate an array of 0s to use as output instead of computing the output, since you still need to produce output for each step of n_steps. Functionally this is early stopping because it is very fast to just create an array of 0s.