Check out example codes for "File "h5py\h5g.pyx", line 161, in h5py.h5g.create ValueError: Unable to create group (name already exists)". It will help you in understanding the concepts better.

Code Example 1

model_json = model.to_json()
with open(file_name + ".json", "w") as json_file:
        json_file.write(model_json)
model.save_weights(file_name + '.h5')

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