Failed to run python code: copy_string=history.history.keys()[0]

in tmva/pymva/src/MethodPyKeras.cxx when run with python3

Output:

Epoch 00005: val_loss improved from 0.62125 to 0.60703, saving model to dataset/weights/TrainedModel_PyKeras.h5
Getting his:0
<WARNING> : Failed to run python code: copy_string=history.history.keys()[0]
<WARNING> : Python error message:
Traceback (most recent call last):
{{ File "<string>", line 1, in <module>}}
TypeError: 'dict_keys' object does not support indexing
<FATAL> : Failed to run python code
***> abort program execution

In python3  'dict_keys' object does not support indexing (it is not a list), could be corrected by replacing history.history.keys()[%d] in line tmva/pymva/src/MethodPyKeras.cxx: line 471 with list(history.history)[%d]