NotImplementedError: Cannot convert a symbolic Tensor (truediv_4:0) to a numpy array.

[nehasaraf1994]

Hello. While training in the first epoch itself, I keep getting this error:

File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 767, in on_epoch
yield epoch_logs
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 342, in fit
total_epochs=epochs)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 181, in run_one_epoch
step += 1
File "/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 119, in exit
next(self.gen)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 789, in on_batch
self.progbar.on_batch_end(step, batch_logs)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/callbacks.py", line 781, in on_batch_end
self.progbar.update(self.seen, self.log_values)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/utils/generic_utils.py", line 559, in update
avg = np.mean(self._values[k][0] / max(1, self._values[k][1]))
File "<array_function internals>", line 6, in mean
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/numpy/core/fromnumeric.py", line 3335, in mean
out=out, **kwargs)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/numpy/core/_methods.py", line 135, in _mean
arr = asanyarray(a)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/numpy/core/_asarray.py", line 138, in asanyarray
return array(a, dtype, copy=False, order=order, subok=True)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/framework/ops.py", line 728, in array
" array.".format(self.name))
NotImplementedError: Cannot convert a symbolic Tensor (truediv_2:0) to a numpy array.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "train.py", line 279, in
main()
File "train.py", line 276, in main
history = parallel_model.fit(train_data_generator, epochs=FLAGS.max_epochs, steps_per_epoch=train_samples_count/FLAGS.batch_size, callbacks=callbacks, verbose=1)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training.py", line 819, in fit
use_multiprocessing=use_multiprocessing)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 397, in fit
prefix='val_')
File "/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 130, in exit
self.gen.throw(type, value, traceback)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/engine/training_v2.py", line 772, in on_epoch
self.progbar.on_epoch_end(epoch, epoch_logs)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/callbacks.py", line 789, in on_epoch_end
self.progbar.update(self.seen, self.log_values)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/keras/utils/generic_utils.py", line 559, in update
avg = np.mean(self._values[k][0] / max(1, self._values[k][1]))
File "<array_function internals>", line 6, in mean
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/numpy/core/fromnumeric.py", line 3335, in mean
out=out, **kwargs)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/numpy/core/_methods.py", line 135, in _mean
arr = asanyarray(a)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/numpy/core/_asarray.py", line 138, in asanyarray
return array(a, dtype, copy=False, order=order, subok=True)
File "/Users/nesaraf/Desktop/tf2Env/lib/python3.7/site-packages/tensorflow_core/python/framework/ops.py", line 728, in array
" array.".format(self.name))
NotImplementedError: Cannot convert a symbolic Tensor (truediv_4:0) to a numpy array.

Not able to figure out why? Please let me know.

[Benrflanders]

Hello @nehasaraf1994, were you able to solve this error? I'm having the same error come up.

I've tried changing verbose output to 0, but end up with the system exiting with code "Killed: 9."