xla

bc7bc15e - Enabled use of BF16 in PyTorch computations via the XLA_USE_BF16=1 environment setting.

Enabled use of BF16 in PyTorch computations via the XLA_USE_BF16=1 environment setting. Changed the local TF service boot up logic, as the previous one was conflicting when the configuration we use when we tunnel to a Borg TFRC service.