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### Description Add CUDA implementation for block sparse attention for Phi-3-small. Block sparse attention was proposed in [Sparse Transformers](https://arxiv.org/pdf/1904.10509) by OpenAI, and also adopted in [BigBird](https://arxiv.org/pdf/2007.14062) with different sparse layout. In Phi-3-small, the sparse layout is static, and works with unidirectional (causal) attention. Compared to dense attention, the benefit of block sparse is to speed up both training and inference. It could save memory thus support longer context length. - [x] Add operator spec and shape inference - [x] Symbolic shape inference - [x] Refactor GroupQueryAttention to expose common kernels for kv cache concatenation, q/k/v transpose etc. - [x] Add cuda kernel to convert block mask to CSR format - [x] Add cuda kernel to generate position ids - [x] Add compile script and template files to convert triton kernel to cubin and dispatcher. - [x] Add triton kernel v1 for prompt - [x] Add triton kernel v2 for token generation and support padding - [x] Update IO Binding Helper to allow buffer sharing. - [x] Test relevance - [x] Test performance ### Performance Test in A100-SXM4-80GB with `batch_size=4, num_heads=32, max_seq_len=8192, head_size=128, sparse_block_size=64, local_blocks=16, vert_stride=8, num_layout=8` We compare sparse attention to corresponding GQA with local attention windows size 1024, or GQA with dense causal. Average latency in milliseconds (for fused attention kernel used in prompt prefilling): seq_len | GQA-Dense | GQA-Local | SparseAttention -- | -- | -- | -- 64 | 0.0465 | 0.0722 | 0.0641 128 | 0.0618 | 0.0787 | 0.0672 256 | 0.1086 | 0.1076 | 0.0943 512 | 0.2535 | 0.2487 | 0.1676 1024 | 0.7042 | 0.7050 | 0.3800 2048 | 2.4125 | 1.9316 | 0.8966 4096 | 8.9346 | 4.5699 | 2.1129 8192 | 40.5401 | 10.3508 | 5.1748 Average latency in milliseconds (for fused attention kernel used in token generation: past_seq_len | GQA-Dense | GQA-Local | SparseAttention -- | -- | -- | -- 64 | 0.0186 | 0.0186 | 0.0870 128 | 0.0408 | 0.0466 | 0.1165 256 | 0.0530 | 0.0592 | 0.0988 512 | 0.0445| 0.0447 | 0.1150 1024 | 0.0634 | 0.0640 | 0.1454 2048 | 0.1027 | 0.0637 | 0.1589 4096 | 0.1789 | 0.0631 | 0.1806 8192 | 0.3288 | 0.0655 | 0.2146 We can see that the kernel for token generation still have room to improve. #### Limitations Only support right-side padding and unidirectional attention. The following are not supported in the first version: (1) Packed mode like PackedMultiHeadAttention where input has been removed padding. (2) paged attention. (3) bidirectional attention. (4) GPU compute capacity that is not 8.0, 8.6 and 8.9. (5) Left side padding. Some of these limitations will be removed in the future (may be in a new operator). |
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| .. | ||
| common | ||
| contrib_ops | ||
| cuda_host | ||
| custom_op_registration | ||
| debug_node_inputs_outputs | ||
| flatbuffers | ||
| framework | ||
| fuzzing | ||
| global_thread_pools | ||
| ir | ||
| logging_apis | ||
| mlas | ||
| onnx | ||
| opaque_api | ||
| optimizer | ||
| perftest | ||
| platform | ||
| proto | ||
| providers | ||
| python | ||
| quantization | ||
| shared_lib | ||
| testdata | ||
| unittest_main | ||
| util | ||
| wasm | ||
| win_getopt | ||
| xctest | ||
| run_benchmark.py | ||
| run_benchmark.readme.md | ||