I had the same issue caused by last keras release,what i remember did():
1-Upgrade tensorflow:
pip install --user --upgrade tensorflow-gpu
(there might be some missing packages, just pip install them)
2-Upgrade Tensorboard
pip install --user --upgrade tensorboard
(there might be some missing packages, just pip install them)
3-Downgrade Keras
pip install keras==2.3.1
(latest version working for me)
4-Downgrade tensorflow-gpu
pip install --user --upgrade tensorflow-gpu==1.14.0
(latest version working for me)
Let me know if worked!
Anaconda 2020.02
Python 3.7
CPU i3 8100
OS Windows 10 64
Nvidia GPU GTX1050TI
CUDA 10.1
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