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* fix: Add stream synchronization before destroying MPI communicator (#1979)
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* feat: Implement column-wise userbuffer overlap for comm+GEMM operations

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  - Modify userbuffers send/recv loops to use rank-ordered iteration
  - Add userbuffers_send_all/recv_all function declarations

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  - Expose new overlap function via pybind11 bindings
  - Update overlap method configurations to include more ring_exchange ops

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  - Use fill_userbuffers_buffer_for_all_gather for efficient buffering

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[PyTorch] fix input_quantizer usage for save_original_input; fix blockwise FP8 convert_and_update_tensor (#1978)

* fix input_quantizer in save_original_input bwd
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* fix get shape of blockwise tensor with only compact colwise data
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* fix bug if all values<0
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* minor fix
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