triposf/modules/attention/__init__.py

# MIT License

# Copyright (c) Microsoft Corporation.
# Copyright (c) 2025 VAST-AI-Research and contributors.

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE

from typing import *

BACKEND = 'flash_attn' 
DEBUG = False

def __from_env():
    import os
    
    global BACKEND
    global DEBUG
    
    env_attn_backend = os.environ.get('ATTN_BACKEND')
    env_sttn_debug = os.environ.get('ATTN_DEBUG')
    
    if env_attn_backend is not None and env_attn_backend in ['xformers', 'flash_attn', 'sdpa', 'naive']:
        BACKEND = env_attn_backend
    if env_sttn_debug is not None:
        DEBUG = env_sttn_debug == '1'

    print(f"[ATTENTION] Using backend: {BACKEND}")
        

__from_env()
    

def set_backend(backend: Literal['xformers', 'flash_attn']):
    global BACKEND
    BACKEND = backend

def set_debug(debug: bool):
    global DEBUG
    DEBUG = debug


from .full_attn import *
from .modules import *