* Add utf-8 encoding

* Fix PEP8 error

* Fix PEP8 error

Link to the metrics document(/metrics) was missing in 'Compilation' section. Added one just as other explained arguments.

* Add a test for deadlock after sequence worker timeout

* Call task_done even if the task timeouted

* catch dead worker warning

* fix line length

* Increase deadlock detection timeout to prevent flakiness

* Added comments about the future of Keras.

* Changed msg.

#13239 Improved documentation for EarlyStopping/ReduceLROnPlateau, take validation_freq into account. (#13240)

* Complete the docs by adding data to multi-input/output example

* Add seed for reproducibility

* Finished the functions.

* Started doing the test function.

* Added the batch_normalization operation to the numpy backend.

* forgot an argument

Change line 82 so the reg exp works as it says on token above in the comment
because else it gives - AttributeError: 'NoneType' object has no attribute 'strip'

* #13266 Update lstm_seq2seq.py(from 22% to 87% acc)

I added the codes for applying one-hot encoding on the end of sentences about encoder_input_data, decoder_input_data, and decoder_target_data. I added an accuracy metric for model training. The original code has 22% accuracy, but the proposed code had 87% validation accuracy.

* Update lstm_seq2seq.py

I update code according to PEP8.

* Update lstm_seq2seq.py

Remove whitespace according to PEP 8.

is_tensor_or_variable(x) is undefined and replaced by
K.is_tensor(x) or K.is_variable(x).

Fixes #13306.

# Conflicts:
#	keras/backend/tensorflow_backend.py