Target length zero error

[limhj23]

Hi, I was trying to use your CRNN code and found an error written below. I have to admit that I am new to RNN but I think my all inputs were labeled correctly with your code.

I am stuck with this issue for a while. this blocks me producing my first crnn model :(

Traceback (most recent call last):
File "crnn_train.py", line 97, in
initial_epoch=0)
File "D:\experimental\random_test\testvenv\lib\site-packages\keras\legacy\interfaces.py", line 91, in wrapper
return func(*args, **kwargs)
File "D:\experimental\random_test\testvenv\lib\site-packages\keras\engine\training.py", line 1658, in fit_generator
initial_epoch=initial_epoch)
File "D:\experimental\random_test\testvenv\lib\site-packages\keras\engine\training_generator.py", line 215, in fit_generator
class_weight=class_weight)
File "D:\experimental\random_test\testvenv\lib\site-packages\keras\engine\training.py", line 1449, in train_on_batch
outputs = self.train_function(ins)
File "D:\experimental\random_test\testvenv\lib\site-packages\keras\backend\tensorflow_backend.py", line 2979, in call
return self._call(inputs)
File "D:\experimental\random_test\testvenv\lib\site-packages\keras\backend\tensorflow_backend.py", line 2937, in _call
fetched = self._callable_fn(*array_vals)
File "D:\experimental\random_test\testvenv\lib\site-packages\tensorflow\python\client\session.py", line 1458, in call
run_metadata_ptr)
tensorflow.python.framework.errors_impl.InvalidArgumentError: 2 root error(s) found.
(0) Invalid argument: Labels length is zero in batch 2
[[{{node ctc/CTCLoss}}]]
(1) Invalid argument: Labels length is zero in batch 2
[[{{node ctc/CTCLoss}}]]
[[training/SGD/gradients/ctc/CTCLoss_grad/mul/_315]]