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The PR contains following changes: Python side: - Channel based DSL implementation: decouple channel with chunk. - Users create channel explicitly, only need local_rank, remote_rank and channel_type - Adjust executor json file, add remote_buffer fields, different op can use different channel and remote buffers combination. - Reimplement operation fusion, data dependency check mechanism - Add new op such as semaphore, pipeline - Clean code and enhance document C++ side: - Support new execution file json format - Support semaphore and pipeline operation - code clean, support non-zero copy scenario --------- Co-authored-by: Caio Rocha <caiorocha@microsoft.com> Co-authored-by: Changho Hwang <changhohwang@microsoft.com>