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* moved userbuffers code to TE/common
Signed-off-by: Alp Dener <adener@nvidia.com>

* moved comm+GEMM overlap code to TE/common
Signed-off-by: Alp Dener <adener@nvidia.com>

* removed PyTorch depdency from comm+GEMM overlap in TE/common
Signed-off-by: Alp Dener <adener@nvidia.com>

* added TE/PyTorch wrappers for refactored comm+GEMM overlap code in TE/common
Signed-off-by: Alp Dener <adener@nvidia.com>

* updated TE/PyTorch Python API to match the refactored comm+GEMM overlap code
Signed-off-by: Alp Dener <adener@nvidia.com>

* updated unit tests to work with refactored comm+GEMM overlap code
Signed-off-by: Alp Dener <adener@nvidia.com>

* added a pylint exception to comm+GEMM overlap test runner
Signed-off-by: Alp Dener <adener@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fixing linting errors
Signed-off-by: Alp Dener <adener@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* added documentation for te.initialize_ub
Signed-off-by: Alp Dener <adener@nvidia.com>

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* fixed compile errors when building with NVTE_UB_WITH_MPI=1
Signed-off-by: Alp Dener <adener@nvidia.com>

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* fixed default bootstrap backend
Signed-off-by: Alp Dener <adener@nvidia.com>

* switched default bootstrap backend priority to MPI > Gloo > NCCL
Signed-off-by: Alp Dener <adener@nvidia.com>

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* updated bootstrap backend documentation
Signed-off-by: Alp Dener <adener@nvidia.com>

* close UB bootstrap socket to avoid interfering with CUDA Multicast shareable file handle send/recv
Signed-off-by: Alp Dener <adener@nvidia.com>

* added torch::Tensor wrappers for communication buffer and atomic counters so PyTorch can factor externally allocated memory into its garbage collection threshold
Signed-off-by: Alp Dener <adener@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* automated handling of world, local and node ranks/sizes within C++ CommOverlapHelper to simplify Python function signatures
Signed-off-by: Alp Dener <adener@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fixed incorrect read of environment variables
Signed-off-by: Alp Dener <adener@nvidia.com>

* corrected priority for _SOCKET_IFNAME environment variables in UB bootstrapping
Signed-off-by: Alp Dener <adener@nvidia.com>

* moved multicast support check to cuda_runtime.h and replaced cudaDeviceGetProp call with cached sm_count()
Signed-off-by: Alp Dener <adener@nvidia.com>

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* removed commented out old code and replaced external collective function type defines with aliases
Signed-off-by: Alp Dener <adener@nvidia.com>

* compile-time CUDA version guard for CUDA Driver Multicast attribute
Signed-off-by: Alp Dener <adener@nvidia.com>

* added compile-time CUDA version guards to Multicast code in Userbuffers
Signed-off-by: Alp Dener <adener@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* condensed UB docs, corrected const violations
Signed-off-by: Alp Dener <adener@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fixed autodoc rst for UB calls, added CUDA version guard on Multicast UB kernels
Signed-off-by: Alp Dener <adener@nvidia.com>

* fixed incorrect UB type reporting for P2P overlaps, comment reformatting
Signed-off-by: Alp Dener <adener@nvidia.com>

* add docstring to tex.ubuf_built_with_mpi()
Signed-off-by: Alp Dener <adener@nvidia.com>

---------
Signed-off-by: Alp Dener <adener@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>