[bug-fix] Adjust MKL and KMP Settings (#4443)

* Adjust KMP and interop thread settings

* Don't set affinity, seems to slow down on low-CPU machines

ml-agents/mlagents/torch_utils/torch.py

+import os
+
 # Detect availability of torch package here.
 # NOTE: this try/except is temporary until torch is required for ML-Agents.
 try:
 
-    torch.set_num_threads(1)
+    torch.set_num_interop_threads(2)
+    os.environ["KMP_BLOCKTIME"] = "0"
 
     # Known PyLint compatibility with PyTorch https://github.com/pytorch/pytorch/issues/701
     # pylint: disable=E1101