CTC Loss InvalidArgumentError: sequence_length(b) <= time

Question

I am running into this error while trying to use tf.nn.ctc_loss through keras (ctc_batch_cost):

InvalidArgumentError (see above for traceback): sequen

Answer 1

In this case b is each example in a minibatch. sequence_length(b) is the number of time stamps you have for that example. This is specified in the sequence_length argument passed to tf.nn.ctc_loss which is a 1-d tensor of sequence lengths.