Converts CTC labels from dense to sparse.
Compat aliases for migration
See Migration guide for more details.
tf.compat.v1.keras.backend.ctc_label_dense_to_sparse, tf.compat.v2.keras.backend.ctc_label_dense_to_sparse
tf.compat.v1.keras.backend.ctc_label_dense_to_sparse
tf.compat.v2.keras.backend.ctc_label_dense_to_sparse
tf.keras.backend.ctc_label_dense_to_sparse( labels, label_lengths )
labels
label_lengths
A sparse tensor representation of the labels.