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7ec2223c84
Fix DDPG PyTorch (missing sigmoid layer (to squash action outputs) after deterministic action outputs).
Implementation of the Soft Actor-Critic algorithm:
[1] Soft Actor-Critic Algorithms and Applications - T. Haarnoja, A. Zhou, K. Hartikainen, et. al https://arxiv.org/abs/1812.05905.pdf
For supporting discrete action spaces, we implemented this patch on top of the original algorithm: [2] Soft Actor-Critic for Discrete Action Settings - Petros Christodoulou https://arxiv.org/pdf/1910.07207v2.pdf