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* add default path for ffi include

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* implemented custom call with ffi in csrc

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* add timing for build

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* added threading build back

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[PyTorch] Fixing hang in `initialize_ub()` for multi-node runs after PR901 removal of MPI-dependence (#986)

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* avoid dist.init_device_mesh in comm+GEMM overlap example to support older PyTorch versions
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* applied RS overlap FP8 fix from PR1004
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* fixed segfault in Userbuffers destructor
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* corrected comm+GEMM overlap unit test arguments
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fix 261 compile
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* add parallel build without pyproject
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* removed libcuda.so link at compile time for TE/PyTorch extension
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cache was added in Python 3.9.
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* adding option to select only .cpp files in a dir in the build tool

* change cmake build path

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* Apply formatting
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* added DL framework callbacks for bootstrapping userbuffers without MPI
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* removed userbuffers availability check in TE modules since userbuffers is now always compiled
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Cleanup
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