Enable embedding lookup/lora_a logic for chunked backend (#17692)
Co-authored-by: Bruce Wu <mogicianwu@fb.com> Co-authored-by: Baizhou Zhang <sobereddiezhang@gmail.com> Co-authored-by: Ethan (Yusheng) Su <yushengsu.thu@gmail.com>
This commit is contained in:
Bruce Wu
co-authored by
Bruce Wu
Baizhou Zhang
Ethan Su
Bruce Wu
Baizhou Zhang
Ethan Su
parent
061ec582bf
commit
70a6fb53af
@@ -1,648 +0,0 @@
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import random
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import unittest
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from enum import Enum
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from typing import List, Optional, Tuple
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import torch
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from sglang.srt.lora.backend.chunked_backend import ChunkedSgmvLoRABackend
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from sglang.srt.lora.triton_ops import (
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chunked_sgmv_lora_expand_forward,
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chunked_sgmv_lora_shrink_forward,
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)
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from sglang.srt.lora.triton_ops.chunked_sgmv_expand import _chunked_lora_expand_kernel
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from sglang.srt.lora.triton_ops.chunked_sgmv_shrink import _chunked_lora_shrink_kernel
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from sglang.srt.lora.utils import LoRABatchInfo
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from sglang.test.lora_utils import reference_sgmv_expand, reference_sgmv_shrink
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CHUNK_SIZE = 16
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def reset_kernel_cache():
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_chunked_lora_shrink_kernel._clear_cache()
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_chunked_lora_expand_kernel._clear_cache()
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class BatchComposition(Enum):
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UNIFORM = "uniform"
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MIXED = "mixed"
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SKEWED = "skewed"
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NONE = "_NO_LORA_"
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class BatchMode(Enum):
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PREFILL = "prefill"
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DECODE = "decode"
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TARGET_VERIFY = "verify"
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class TestChunkedSGMV(unittest.TestCase):
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# Test configuration constants
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RTOL = 1e-3
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ATOL = 1e-3
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DEFAULT_BATCH_SIZE = 8
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def _compare_shrink_outputs(
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self,
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chunked_output: torch.Tensor,
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reference_output: torch.Tensor,
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seq_lengths: List[int],
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lora_assignments: List[int],
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batch_info: LoRABatchInfo,
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num_slices: int,
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test_name: str,
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):
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"""
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Compare only the valid portions of shrink outputs.
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The chunked SGMV shrink kernel only guarantees correctness for
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output[seq_start:seq_end, :rank * num_slices] for each sequence.
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"""
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lora_ranks = batch_info.lora_ranks.cpu().numpy()
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token_offset = 0
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for seq_idx, (lora_idx, seq_len) in enumerate(
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zip(lora_assignments, seq_lengths)
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):
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if seq_len == 0:
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continue
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rank = lora_ranks[lora_idx]
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if rank > 0:
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# Only compare the valid columns for this sequence
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valid_cols = num_slices * rank
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chunked_seq = chunked_output[
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token_offset : token_offset + seq_len, :valid_cols
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]
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reference_seq = reference_output[
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token_offset : token_offset + seq_len, :valid_cols
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]
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torch.testing.assert_close(
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chunked_seq,
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reference_seq,
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rtol=self.RTOL,
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atol=self.ATOL,
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msg=f"Shrink operation failed for {test_name}, sequence {seq_idx} ({lora_idx})",
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)
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token_offset += seq_len
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def setUp(self):
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"""Set up common test parameters"""
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torch.manual_seed(42)
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random.seed(42)
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self.device = torch.device("cuda")
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self.dtype = torch.float16
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self.input_dim = 2560 # Hidden dimension
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self.max_seq_len = 1024
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# LoRA configurations: name -> (rank, output_q, output_k, output_v)
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self.lora_configs = {
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"lora_A": (8, 4096, 1024, 1024),
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"lora_B": (16, 4096, 1024, 1024),
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"lora_C": (32, 4096, 1024, 1024),
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"_NO_LORA_": (0, 4096, 1024, 1024),
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}
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# QKV slice offsets: 4096 (Q) + 1024 (K) + 1024 (V) = 6144 total
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self.slice_offsets = torch.tensor(
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[0, 4096, 5120, 6144], dtype=torch.int32, device=self.device
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)
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self.max_slice_size = 4096
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def generate_sequence_lengths(
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self,
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batch_size: int,
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batch_mode: BatchMode = BatchMode.PREFILL,
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min_len: int = 1,
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max_len: int = None,
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) -> List[int]:
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"""Generate sequence lengths for a batch based on mode"""
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if batch_mode == BatchMode.DECODE:
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return [1] * batch_size
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else:
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if max_len is None:
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max_len = self.max_seq_len
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return [random.randint(min_len, max_len) for _ in range(batch_size)]
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def create_lora_weights(
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self, lora_name: str, include_missing_k: bool = False
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) -> Tuple[torch.Tensor, torch.Tensor]:
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"""Create LoRA A and B weights for given configuration"""
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rank, out_q, out_k, out_v = self.lora_configs[lora_name]
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if rank == 0:
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lora_a = torch.empty(
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0, self.input_dim, dtype=self.dtype, device=self.device
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)
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lora_b = torch.empty(
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out_q + out_k + out_v, 0, dtype=self.dtype, device=self.device
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)
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return lora_a, lora_b
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# Create LoRA A weights (3 slices for QKV)
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lora_a = torch.randn(
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3 * rank, self.input_dim, dtype=self.dtype, device=self.device
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)
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if include_missing_k:
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lora_a[rank : 2 * rank, :] = 0.0
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# Create LoRA B weights (stacked Q, K, V)
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total_output_dim = out_q + out_k + out_v
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lora_b = torch.randn(
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total_output_dim, rank, dtype=self.dtype, device=self.device
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)
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if include_missing_k:
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lora_b[out_q : out_q + out_k, :] = 0.0
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return lora_a, lora_b
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def create_batch_info(
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self,
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lora_names: List[str],
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seq_lengths: List[int],
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lora_assignments: List[Optional[int]],
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batch_mode: BatchMode = BatchMode.PREFILL,
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) -> LoRABatchInfo:
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"""Create LoRABatchInfo using the same logic as chunked backend"""
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lora_ranks = [self.lora_configs[name][0] for name in lora_names]
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def create_mock_batch():
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# Create a minimal mock ForwardBatch for the test
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class MockForwardBatch:
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def __init__(self, batch_size, seq_lengths, device):
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self.batch_size = batch_size
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self.extend_seq_lens = torch.tensor(
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seq_lengths, dtype=torch.int32, device=device
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)
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self.extend_seq_lens_cpu = seq_lengths
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self.forward_mode = MockForwardMode()
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class MockForwardMode:
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def is_extend(self):
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return batch_mode == BatchMode.PREFILL
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def is_decode(self):
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return batch_mode == BatchMode.DECODE
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def is_target_verify(self):
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return batch_mode == BatchMode.TARGET_VERIFY
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def is_prefill(self):
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return self.is_extend()
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return MockForwardBatch(len(seq_lengths), seq_lengths, self.device)
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mock_batch = create_mock_batch()
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# Use the same functions as chunked backend
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permutation, weights_reordered = ChunkedSgmvLoRABackend._get_permutation(
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lora_assignments, mock_batch
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)
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# Create a minimal backend instance to access _get_segments_info
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mock_server_args = type(
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"ServerArgs", (object,), {"max_lora_chunk_size": "MOCK_NEVER_USED"}
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)
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mock_backend = ChunkedSgmvLoRABackend(
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max_loras_per_batch=8, device=self.device, server_args=mock_server_args
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)
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weight_indices_list, seg_indptr = mock_backend._get_segments_info(
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weights_reordered,
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chunk_size=CHUNK_SIZE,
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)
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scalings = [1.0] * len(lora_names)
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seg_indptr_tensor = seg_indptr.to(self.device)
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weight_indices_tensor = weight_indices_list.to(self.device)
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lora_ranks_tensor = (
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torch.tensor(lora_ranks, dtype=torch.int32, device=self.device)
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if lora_ranks
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else torch.empty(0, dtype=torch.int32, device=self.device)
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)
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scalings_tensor = (
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torch.tensor(scalings, dtype=torch.float32, device=self.device)
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if scalings
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else torch.empty(0, dtype=torch.float32, device=self.device)
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)
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permutation_tensor = permutation.to(
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self.device, dtype=torch.int32
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) # Convert to int32 for LoRABatchInfo
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seq_lens_tensor = torch.tensor(
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seq_lengths, dtype=torch.int32, device=self.device
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)
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return LoRABatchInfo(
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use_cuda_graph=False,
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bs=len(seq_lengths),
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num_segments=len(weight_indices_list), # Number of segments, not sequences!
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seg_indptr=seg_indptr_tensor,
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weight_indices=weight_indices_tensor,
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lora_ranks=lora_ranks_tensor,
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scalings=scalings_tensor,
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seg_lens=seq_lens_tensor, # Original sequence lengths for reference
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max_len=CHUNK_SIZE,
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permutation=permutation_tensor, # Token reordering permutation
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)
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def stack_lora_weights(
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self, weight_list: List[torch.Tensor], is_lora_a: bool
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) -> torch.Tensor:
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"""Stack LoRA weights from different adapters into a single tensor"""
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if not weight_list:
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return torch.empty(0, 0, 0, dtype=self.dtype, device=self.device)
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first_non_empty = next((w for w in weight_list if w.numel() > 0), None)
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if first_non_empty is None:
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return torch.empty(
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len(weight_list), 0, 0, dtype=self.dtype, device=self.device
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)
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if is_lora_a:
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# LoRA A: (slice_num * rank, input_dim) -> (num_loras, slice_num * max_rank, input_dim)
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max_rank = max(w.shape[0] // 3 if w.numel() > 0 else 0 for w in weight_list)
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final_shape = (len(weight_list), 3 * max_rank, self.input_dim)
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else:
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# LoRA B: (output_dim, rank) -> (num_loras, output_dim, max_rank)
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max_rank = max(w.shape[1] if w.numel() > 0 else 0 for w in weight_list)
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output_dim = first_non_empty.shape[0]
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final_shape = (len(weight_list), output_dim, max_rank)
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stacked = torch.zeros(final_shape, dtype=self.dtype, device=self.device)
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for i, weight in enumerate(weight_list):
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if weight.numel() > 0:
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if is_lora_a:
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stacked[i, : weight.shape[0], :] = weight
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else:
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stacked[i, :, : weight.shape[1]] = weight
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return stacked
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def create_test_batch(
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self,
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batch_composition: BatchComposition,
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batch_size: int,
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batch_mode: BatchMode = BatchMode.PREFILL,
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include_missing_k: bool = False,
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) -> Tuple[
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torch.Tensor,
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List[Tuple[torch.Tensor, torch.Tensor]],
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LoRABatchInfo,
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List[int],
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List[str],
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]:
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"""Create test batch with specified composition and mode"""
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# Reset kernel cache to avoid cross-test contamination
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reset_kernel_cache()
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seq_lengths = self.generate_sequence_lengths(
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batch_size, batch_mode, 1, self.max_seq_len
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)
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if batch_composition == BatchComposition.UNIFORM:
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lora_names = ["lora_A"]
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lora_assignments = [lora_names.index("lora_A")] * batch_size
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elif batch_composition == BatchComposition.MIXED:
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lora_names = ["lora_A", "lora_B", "lora_C", None]
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lora_assignments = [(i % len(lora_names)) for i in range(batch_size)]
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elif batch_composition == BatchComposition.SKEWED:
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lora_names = ["lora_A", "lora_B"]
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num_minority = max(1, batch_size // 8)
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lora_assignments = [lora_names.index("lora_A")] * num_minority + [
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lora_names.index("lora_B")
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] * (batch_size - num_minority)
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random.shuffle(lora_assignments)
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elif batch_composition == BatchComposition.NONE:
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lora_names = [None]
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lora_assignments = [0] * batch_size
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else:
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raise ValueError(f"Unknown batch composition: {batch_composition}")
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total_seq_len = sum(seq_lengths)
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x = torch.randn(
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total_seq_len, self.input_dim, dtype=self.dtype, device=self.device
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)
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normalized_lora_names = [
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"_NO_LORA_" if name is None else name for name in lora_names
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]
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weights = []
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for lora_name in normalized_lora_names:
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weights.append(self.create_lora_weights(lora_name, include_missing_k))
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batch_info = self.create_batch_info(
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normalized_lora_names, seq_lengths, lora_assignments, batch_mode
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)
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return x, weights, batch_info, seq_lengths, lora_assignments
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def run_test_comparison(
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self,
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x: torch.Tensor,
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weights: List[Tuple[torch.Tensor, torch.Tensor]],
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batch_info: LoRABatchInfo,
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seq_lengths: List[int],
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lora_assignments: List[int],
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test_name: str,
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):
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"""Run comparison between chunked and reference implementations"""
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if not weights: # Handle case with no LoRA weights
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return
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lora_assignments_tensor = torch.tensor(
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lora_assignments, dtype=torch.int32, device="cpu"
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)
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seq_lengths_tensor = torch.tensor(seq_lengths, dtype=torch.int32, device="cpu")
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lora_ranks_tensor = batch_info.lora_ranks.detach().cpu()
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scalings_tensor = batch_info.scalings.detach().cpu()
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# Stack LoRA A weights
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lora_a_weights = [weight[0] for weight in weights]
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stacked_lora_a = self.stack_lora_weights(lora_a_weights, is_lora_a=True)
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# Stack LoRA B weights
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lora_b_weights = [weight[1] for weight in weights]
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stacked_lora_b = self.stack_lora_weights(lora_b_weights, is_lora_a=False)
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# Test shrink operation
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chunked_shrink = chunked_sgmv_lora_shrink_forward(
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x, stacked_lora_a, batch_info, num_slices=3
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)
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reference_shrink = reference_sgmv_shrink(
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x,
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stacked_lora_a,
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lora_assignments_tensor,
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seq_lengths_tensor,
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lora_ranks_tensor,
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scalings_tensor,
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num_slices=3,
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)
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# Only compare valid portions of shrink output (first rank * num_slices columns per sequence)
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self._compare_shrink_outputs(
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chunked_shrink,
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reference_shrink,
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seq_lengths,
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lora_assignments,
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batch_info,
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num_slices=3,
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test_name=test_name,
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)
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# Test expand operation
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chunked_expand = chunked_sgmv_lora_expand_forward(
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reference_shrink,
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stacked_lora_b,
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batch_info,
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self.slice_offsets,
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self.max_slice_size,
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base_output=None,
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)
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reference_expand = reference_sgmv_expand(
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reference_shrink,
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stacked_lora_b,
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lora_assignments_tensor,
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seq_lengths_tensor,
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lora_ranks_tensor,
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self.slice_offsets,
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)
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torch.testing.assert_close(
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chunked_expand,
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reference_expand,
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rtol=self.RTOL,
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atol=self.ATOL,
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msg=f"Expand operation failed for {test_name}",
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)
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# === Basic Operations Tests ===
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def test_shrink_basic(self):
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"""Test basic shrink operation against PyTorch reference"""
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for batch_size in [1, 2, 16, 64]:
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with self.subTest(batch_size=batch_size):
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x, weights, batch_info, seq_lengths, lora_assignments = (
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self.create_test_batch(BatchComposition.UNIFORM, batch_size)
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)
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lora_assignments_tensor = torch.tensor(
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lora_assignments, dtype=torch.int32, device="cpu"
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)
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seq_lengths_tensor = torch.tensor(
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seq_lengths, dtype=torch.int32, device="cpu"
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)
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lora_ranks_tensor = batch_info.lora_ranks.detach().cpu()
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scalings_tensor = batch_info.scalings.detach().cpu()
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lora_a_weights = [weight[0] for weight in weights]
|
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stacked_lora_a = self.stack_lora_weights(lora_a_weights, is_lora_a=True)
|
||||
|
||||
chunked_shrink = chunked_sgmv_lora_shrink_forward(
|
||||
x, stacked_lora_a, batch_info, num_slices=3
|
||||
)
|
||||
reference_shrink = reference_sgmv_shrink(
|
||||
x,
|
||||
stacked_lora_a,
|
||||
lora_assignments_tensor,
|
||||
seq_lengths_tensor,
|
||||
lora_ranks_tensor,
|
||||
scalings_tensor,
|
||||
num_slices=3,
|
||||
)
|
||||
|
||||
torch.testing.assert_close(
|
||||
chunked_shrink, reference_shrink, rtol=self.RTOL, atol=self.ATOL
|
||||
)
|
||||
|
||||
def test_expand_basic(self):
|
||||
"""Test basic expand operation against PyTorch reference"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(BatchComposition.UNIFORM, batch_size)
|
||||
)
|
||||
|
||||
lora_assignments_tensor = torch.tensor(
|
||||
lora_assignments, dtype=torch.int32, device="cpu"
|
||||
)
|
||||
seq_lengths_tensor = torch.tensor(
|
||||
seq_lengths, dtype=torch.int32, device="cpu"
|
||||
)
|
||||
lora_ranks_tensor = batch_info.lora_ranks.detach().cpu()
|
||||
scalings_tensor = batch_info.scalings.detach().cpu()
|
||||
|
||||
lora_a_weights = [weight[0] for weight in weights]
|
||||
stacked_lora_a = self.stack_lora_weights(lora_a_weights, is_lora_a=True)
|
||||
|
||||
intermediate = reference_sgmv_shrink(
|
||||
x,
|
||||
stacked_lora_a,
|
||||
lora_assignments_tensor,
|
||||
seq_lengths_tensor,
|
||||
lora_ranks_tensor,
|
||||
scalings_tensor,
|
||||
num_slices=3,
|
||||
)
|
||||
|
||||
lora_b_weights = [weight[1] for weight in weights]
|
||||
stacked_lora_b = self.stack_lora_weights(
|
||||
lora_b_weights, is_lora_a=False
|
||||
)
|
||||
|
||||
chunked_expand = chunked_sgmv_lora_expand_forward(
|
||||
intermediate,
|
||||
stacked_lora_b,
|
||||
batch_info,
|
||||
self.slice_offsets,
|
||||
self.max_slice_size,
|
||||
base_output=None,
|
||||
)
|
||||
reference_expand = reference_sgmv_expand(
|
||||
intermediate,
|
||||
stacked_lora_b,
|
||||
lora_assignments_tensor,
|
||||
seq_lengths_tensor,
|
||||
lora_ranks_tensor,
|
||||
self.slice_offsets,
|
||||
)
|
||||
|
||||
torch.testing.assert_close(
|
||||
chunked_expand, reference_expand, rtol=self.RTOL, atol=self.ATOL
|
||||
)
|
||||
|
||||
# === QKV Operations Test ===
|
||||
|
||||
def test_qkv_missing_projections(self):
|
||||
"""Test QKV operations with missing k_proj (Qwen3 scenario)"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(
|
||||
BatchComposition.MIXED, batch_size, include_missing_k=True
|
||||
)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"QKV missing k_proj batch_size={batch_size}",
|
||||
)
|
||||
|
||||
# === Batch Composition Tests ===
|
||||
|
||||
def test_uniform_lora_batch(self):
|
||||
"""All sequences use same LoRA, random sequence lengths"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(BatchComposition.UNIFORM, batch_size)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"uniform batch_size={batch_size}",
|
||||
)
|
||||
|
||||
def test_evenly_mixed_lora_batch(self):
|
||||
"""Sequences evenly distributed across LoRAs, random lengths"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(BatchComposition.MIXED, batch_size)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"mixed batch_size={batch_size}",
|
||||
)
|
||||
|
||||
def test_highly_skewed_lora_batch(self):
|
||||
"""Highly uneven LoRA distribution, random lengths"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(BatchComposition.SKEWED, batch_size)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"skewed batch_size={batch_size}",
|
||||
)
|
||||
|
||||
# === Decode Mode Tests ===
|
||||
|
||||
def test_decode_uniform_lora_batch(self):
|
||||
"""Decode mode: All sequences use same LoRA, all length 1"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(
|
||||
BatchComposition.UNIFORM, batch_size, BatchMode.DECODE
|
||||
)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"decode uniform batch_size={batch_size}",
|
||||
)
|
||||
|
||||
def test_decode_mixed_lora_batch(self):
|
||||
"""Decode mode: Sequences distributed across LoRAs, all length 1"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(
|
||||
BatchComposition.MIXED, batch_size, BatchMode.DECODE
|
||||
)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"decode mixed batch_size={batch_size}",
|
||||
)
|
||||
|
||||
def test_decode_skewed_lora_batch(self):
|
||||
"""Decode mode: Highly uneven LoRA distribution, all length 1"""
|
||||
for batch_size in [1, 2, 16, 64]:
|
||||
with self.subTest(batch_size=batch_size):
|
||||
x, weights, batch_info, seq_lengths, lora_assignments = (
|
||||
self.create_test_batch(
|
||||
BatchComposition.SKEWED, batch_size, BatchMode.DECODE
|
||||
)
|
||||
)
|
||||
self.run_test_comparison(
|
||||
x,
|
||||
weights,
|
||||
batch_info,
|
||||
seq_lengths,
|
||||
lora_assignments,
|
||||
f"decode skewed batch_size={batch_size}",
|
||||
)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
unittest.main()
|
||||
Reference in New Issue
Block a user