[dev] [DeepSeek-v4] Context Parallel support#5087
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Add CuteDSL kernels for compressor-prep compact, KV full packing, rank-major repack, and final idx lowering. Wire the THD CP path to fixed-capacity compression/packing and optimize indexer-loss lowering with seq-major to rank-major lookup. Rename and extend CP utility tests for the fused helpers.
…/dsv4-cp-fallback # Conflicts: # megatron/core/transformer/experimental_attention_variant/csa.py # megatron/core/transformer/experimental_attention_variant/deepseek_v4_hybrid_attention.py # megatron/core/transformer/experimental_attention_variant/dsa.py # megatron/core/transformer/experimental_attention_variant/dsa_kernels.py # tests/unit_tests/transformer/experimental_attention_variant/test_attention_variant_csa.py # tests/unit_tests/transformer/experimental_attention_variant/test_dsa_kernels.py # tests/unit_tests/transformer/experimental_attention_variant/test_dsv4_hybrid_native_parity.py
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What does this PR do ?
Add CP support for DS v4
Depends on #5011
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