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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
import os

from maskrcnn_benchmark.utils.imports import import_file


def setup_environment():
    """Perform environment setup work. The default setup is a no-op, but this

    function allows the user to specify a Python source file that performs

    custom setup work that may be necessary to their computing environment.

    """
    custom_module_path = os.environ.get("TORCH_DETECTRON_ENV_MODULE")
    if custom_module_path:
        setup_custom_environment(custom_module_path)
    else:
        # The default setup is a no-op
        pass


def setup_custom_environment(custom_module_path):
    """Load custom environment setup from a Python source file and run the setup

    function.

    """
    module = import_file("maskrcnn_benchmark.utils.env.custom_module", custom_module_path)
    assert hasattr(module, "setup_environment") and callable(
        module.setup_environment
    ), (
        "Custom environment module defined in {} does not have the "
        "required callable attribute 'setup_environment'."
    ).format(
        custom_module_path
    )
    module.setup_environment()


# Force environment setup when this module is imported
setup_environment()