__init__.py

# Copyright (c) 2022-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#
# See LICENSE for license information.

"""Top level package"""

# pylint: disable=unused-import

import os
from importlib import metadata
import transformer_engine.common

try:
    from . import pytorch
except ImportError:
    try:
        from . import pytorch
    except ImportError:
        pass
except FileNotFoundError as e:
    if "Could not find shared object file" not in str(e):
        raise e  # Unexpected error
    else:
        if os.getenv("NVTE_FRAMEWORK"):
            frameworks = os.getenv("NVTE_FRAMEWORK").split(",")
            if "pytorch" in frameworks or "all" in frameworks:
                raise e
        else:
            # If we got here, we could import `torch` but could not load the framework extension.
            # This can happen when a user wants to work only with `transformer_engine.jax` on a system that
            # also has a PyTorch installation. In order to enable that use case, we issue a warning here
            # about the missing PyTorch extension in case the user hasn't set NVTE_FRAMEWORK.
            import warnings

            warnings.warn(
                "Detected a PyTorch installation but could not find the shared object file for the "
                "Transformer Engine PyTorch extension library. If this is not intentional, please "
                "reinstall Transformer Engine with `pip install transformer_engine[pytorch]` or "
                "build from source with `NVTE_FRAMEWORK=pytorch`.",
                category=RuntimeWarning,
            )

try:
    from . import jax
except ImportError:
    pass
except FileNotFoundError as e:
    if "Could not find shared object file" not in str(e):
        raise e  # Unexpected error
    else:
        if os.getenv("NVTE_FRAMEWORK"):
            frameworks = os.getenv("NVTE_FRAMEWORK").split(",")
            if "jax" in frameworks or "all" in frameworks:
                raise e
        else:
            # If we got here, we could import `jax` but could not load the framework extension.
            # This can happen when a user wants to work only with `transformer_engine.pytorch` on a system
            # that also has a Jax installation. In order to enable that use case, we issue a warning here
            # about the missing Jax extension in case the user hasn't set NVTE_FRAMEWORK.
            import warnings

            warnings.warn(
                "Detected a Jax installation but could not find the shared object file for the "
                "Transformer Engine Jax extension library. If this is not intentional, please "
                "reinstall Transformer Engine with `pip install transformer_engine[jax]` or "
                "build from source with `NVTE_FRAMEWORK=jax`.",
                category=RuntimeWarning,
            )

__version__ = str(metadata.version("transformer_engine"))