""" JIT scripting/tracing utils

Hacked together by / Copyright 2020 Ross Wightman
"""
import torch


def set_jit_legacy():
    """ Set JIT executor to legacy w/ support for op fusion
    This is hopefully a temporary need in 1.5/1.5.1/1.6 to restore performance due to changes
    in the JIT exectutor. These API are not supported so could change.
    """
    #
    assert hasattr(torch._C, '_jit_set_profiling_executor'), "Old JIT behavior doesn't exist!"
    torch._C._jit_set_profiling_executor(False)
    torch._C._jit_set_profiling_mode(False)
    torch._C._jit_override_can_fuse_on_gpu(True)
    #torch._C._jit_set_texpr_fuser_enabled(True)