common.py 21.9 KB
Newer Older
1
2
3
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
from dataclasses import dataclass
4
from typing import Any
5
6
7
8
9

import torch

import vllm._custom_ops as ops
import vllm.model_executor.layers.fused_moe.modular_kernel as mk
10
from tests.kernels.moe.utils import make_test_weights, per_token_cast_to_fp8
11
12
13
14
15
from tests.kernels.quantization.nvfp4_utils import (
    FLOAT4_E2M1_MAX,
    FLOAT8_E4M3_MAX,
    dequantize_nvfp4_to_dtype,
)
16
17
18
from tests.kernels.utils import torch_experts
from vllm.config import VllmConfig
from vllm.distributed import get_dp_group, get_tensor_model_parallel_world_size
19
from vllm.forward_context import set_forward_context
20
from vllm.model_executor.layers.fused_moe.config import (
21
22
23
24
    FusedMoEConfig,
    FusedMoEParallelConfig,
    FusedMoEQuantConfig,
)
25
from vllm.model_executor.layers.fused_moe.fused_moe import fused_topk
26
from vllm.utils.import_utils import has_deep_ep, has_deep_gemm, has_pplx
27

28
29
30
31
32
33
34
from .mk_objects import (
    TestMoEQuantConfig,
    expert_info,
    make_fused_experts,
    make_prepare_finalize,
    prepare_finalize_info,
)
35
36
37
from .parallel_utils import ProcessGroupInfo


38
def _describe_tensor(t: torch.Tensor | None, name: str) -> str:
39
40
41
42
43
44
45
46
    if t is None:
        return f"{name} : None"
    else:
        return f"{name} : {t.shape} {t.dtype} {t.device}"


@dataclass
class Config:
47
    Ms: list[int] | int
48
49
50
    K: int
    N: int
    E: int
51
    topks: list[int] | int
52
    dtype: torch.dtype
53
    quant_config: TestMoEQuantConfig | None
54
55
56
57

    prepare_finalize_type: mk.FusedMoEPrepareAndFinalize
    fused_experts_type: mk.FusedMoEPermuteExpertsUnpermute

58
    fused_moe_chunk_size: int | None
59
60
    world_size: int

61
    torch_trace_dir_path: str | None = None
62

63
64
    def __post_init__(self):
        if self.quant_config is None:
65
            self.quant_config = TestMoEQuantConfig(None, False, False, None)
66

67
68
    def describe(self) -> str:
        s = ""
69
70
71
72
73
74
75
76
77
78
79
80
        s += "== Config:\n"
        s += f" world_size={self.world_size}\n"
        s += f" PF={self.prepare_finalize_type.__name__}\n"
        s += f" FE={self.fused_experts_type.__name__}\n"
        s += f" E={self.E}\n"
        s += f" Ms={self.Ms}\n"
        s += f" N={self.N}\n"
        s += f" K={self.K}\n"
        s += f" topk={self.topks}\n"
        s += f" dtype={self.dtype}\n"
        s += f" fused_moe_chunk_size={self.fused_moe_chunk_size}\n"
        s += " Quant:\n"
81
        if self.quant_config is not None:
82
83
84
85
            s += f"     q_dtype={self.quant_dtype}\n"
            s += f"     q_block_shape={self.quant_block_shape}\n"
            s += f"     q_per_out_ch_quant={self.is_per_out_ch_quant}\n"
            s += f"     q_per_act_token={self.is_per_act_token_quant}\n"
86
        else:
87
            s += "     quant=None\n"
88
89
90
91
92
93
94
95
        return s

    @property
    def M(self) -> int:
        assert isinstance(self.Ms, int)
        return self.Ms

    @property
96
    def quant_dtype(self) -> torch.dtype | str | None:
97
        assert self.quant_config is not None
98
99
100
101
        return self.quant_config.quant_dtype

    @property
    def is_per_act_token_quant(self) -> bool:
102
        assert self.quant_config is not None
103
104
105
106
        return self.quant_config.per_act_token_quant

    @property
    def is_per_tensor_act_quant(self) -> bool:
107
        return not self.is_per_act_token_quant and self.quant_block_shape is None
108
109
110

    @property
    def is_per_out_ch_quant(self) -> bool:
111
        assert self.quant_config is not None
112
113
114
        return self.quant_config.per_out_ch_quant

    @property
115
    def quant_block_shape(self) -> list[int] | None:
116
        assert self.quant_config is not None
117
118
119
120
121
122
123
124
125
126
127
128
129
        return self.quant_config.block_shape

    @property
    def topk(self) -> int:
        assert isinstance(self.topks, int)
        return self.topks

    @property
    def num_local_experts(self) -> int:
        return self.E // self.world_size

    def make_env_data(self) -> tuple[VllmConfig, dict[Any, Any]]:
        """
130
        make env data for vllm launch.
131
132
133
134
135
136
137
138
        """
        vllm_config = VllmConfig()
        vllm_config.parallel_config.data_parallel_size = self.world_size
        vllm_config.parallel_config.enable_expert_parallel = True

        env_dict = {
            "VLLM_USE_DEEP_GEMM": str(int(self.needs_deep_gemm())),
        }
139
140

        backend = self.all2all_backend()
141
        vllm_config.parallel_config.all2all_backend = backend
142
143
144
        if backend is not None:
            env_dict.update({"VLLM_ALL2ALL_BACKEND": backend})

145
146
        if self.fused_moe_chunk_size is not None:
            env_dict.update(
147
148
                {"VLLM_FUSED_MOE_CHUNK_SIZE": str(self.fused_moe_chunk_size)}
            )
149

150
151
152
        return vllm_config, env_dict

    def is_fp8_block_quantized(self):
153
154
155
156
        return (
            self.quant_dtype == torch.float8_e4m3fn
            and self.quant_block_shape is not None
        )
157
158

    def is_batched_prepare_finalize(self):
159
        info = prepare_finalize_info(self.prepare_finalize_type)
160
        return mk.FusedMoEActivationFormat.BatchedExperts == info.activation_format
161
162

    def is_batched_fused_experts(self):
163
        info = expert_info(self.fused_experts_type)
164
        return mk.FusedMoEActivationFormat.BatchedExperts == info.activation_format
165
166

    def is_standard_fused_experts(self):
167
168
169
170
171
172
173
174
175
176
177
178
179
180
        info = expert_info(self.fused_experts_type)
        return mk.FusedMoEActivationFormat.Standard == info.activation_format

    def fe_supported_types(self):
        info = expert_info(self.fused_experts_type)
        return info.supported_dtypes

    def pf_supported_types(self):
        info = prepare_finalize_info(self.prepare_finalize_type)
        return info.supported_dtypes

    def is_block_quant_supported(self):
        info = expert_info(self.fused_experts_type)
        return info.blocked_quantization_support
181
182

    def is_fe_supports_chunking(self):
183
184
185
186
187
188
189
190
191
192
        info = expert_info(self.fused_experts_type)
        return info.supports_chunking

    def supports_expert_map(self):
        info = expert_info(self.fused_experts_type)
        return info.supports_expert_map

    def supports_apply_weight_on_input(self):
        info = prepare_finalize_info(self.prepare_finalize_type)
        return info.supports_apply_weight_on_input
193
194

    def needs_deep_gemm(self):
195
196
        info = expert_info(self.fused_experts_type)
        return info.needs_deep_gemm
197
198

    def needs_pplx(self):
199
200
        info = prepare_finalize_info(self.prepare_finalize_type)
        return info.backend == "pplx"
201
202

    def needs_deep_ep(self):
203
        info = prepare_finalize_info(self.prepare_finalize_type)
204
205
206
207
        return (
            info.backend == "deepep_high_throughput"
            or info.backend == "deepep_low_latency"
        )
208
209

    def all2all_backend(self):
210
211
        info = prepare_finalize_info(self.prepare_finalize_type)
        return info.backend
212

213
    def is_valid(self) -> tuple[bool, str | None]:
214
215
216
        # Check prepare-finalize and fused-experts compatibility
        if self.is_batched_prepare_finalize():
            if not self.is_batched_fused_experts():
217
                return False, "Mismatched format."
218
219
        else:
            if not self.is_standard_fused_experts():
220
                return False, "Mismatched format."
221
222
223

        use_chunking = self.fused_moe_chunk_size is not None
        if use_chunking and not self.is_fe_supports_chunking():
224
            return False, "Chunking not supported."
225
226

        # Check quantization sanity
227
228
229
230
231
        if (
            int(self.is_per_act_token_quant)
            + int(self.is_per_tensor_act_quant)
            + int(self.quant_block_shape is not None)
        ) > 1:
232
            # invalid quant config
233
            return False, f"Bad quant_config {self.quant_config}."
234

235
236
        # check type support
        if self.quant_dtype is None:
237
238
239
240
            if (
                self.dtype not in self.pf_supported_types()
                or self.dtype not in self.fe_supported_types()
            ):
241
242
243
244
245
                return False, (
                    f"Unsupported type {self.dtype} not in "
                    f"{self.pf_supported_types()} and "
                    f"{self.fe_supported_types()}."
                )
246
        else:
247
248
249
250
            if (
                self.quant_dtype not in self.pf_supported_types()
                or self.quant_dtype not in self.fe_supported_types()
            ):
251
252
253
254
255
                return False, (
                    f"Unsupported quant type {self.quant_dtype} "
                    f"not in {self.pf_supported_types()} and "
                    f"{self.fe_supported_types()}."
                )
256

257
        # Check block quanization support
258
        is_block_quatized = self.quant_block_shape is not None
259
        if is_block_quatized and self.quant_dtype is None:
260
261
            return False, "No block quantization support."

262
        if is_block_quatized and not self.is_block_quant_supported():
263
            return False, "Mismatched block quantization support."
264
265
266

        # deep_gemm only works with block-quantized
        if self.needs_deep_gemm() and not is_block_quatized:
267
            return False, "Needs DeepGEMM but not block quantized."
268

269
        # Check dependencies (turn into asserts?)
270
        if self.needs_deep_ep() and not has_deep_ep():
271
            return False, "Needs DeepEP, but DeepEP not available."
272
        if self.needs_deep_gemm() and not has_deep_gemm():
273
            return False, "Needs DeepGEMM, but DeepGEMM not available."
274
        if self.needs_pplx() and not has_pplx():  # noqa: SIM103
275
            return False, "Needs PPLX, but PPLX not available."
276

277
        return True, None
278
279
280
281
282
283


@dataclass
class WeightTensors:
    w1: torch.Tensor
    w2: torch.Tensor
284
285
286
287
    w1_scale: torch.Tensor | None
    w2_scale: torch.Tensor | None
    w1_gs: torch.Tensor | None = None
    w2_gs: torch.Tensor | None = None
288
289
290
291

    def describe(self):
        s = ""
        s += "== Weight Tensors: \n"
292
293
294
295
296
297
        s += f" - {_describe_tensor(self.w1, 'w1')} \n"
        s += f" - {_describe_tensor(self.w2, 'w2')} \n"
        s += f" - {_describe_tensor(self.w1_scale, 'w1_scale')} \n"
        s += f" - {_describe_tensor(self.w2_scale, 'w2_scale')} \n"
        s += f" - {_describe_tensor(self.w1_gs, 'w1_gs')} \n"
        s += f" - {_describe_tensor(self.w2_gs, 'w2_gs')} \n"
298
299
        return s

300
301
    def is_quantized(self) -> bool:
        # or w1_scale is not None?
302
303
304
305
306
        return (
            self.w1.dtype == torch.float8_e4m3fn
            or self.w1.dtype == torch.uint8
            or self.w1.dtype == torch.int8
        )
307

308
    def to_current_device(self):
309
310
311
        device = torch.cuda.current_device()
        self.w1 = self.w1.to(device=device)
        self.w2 = self.w2.to(device=device)
312

313
314
315
316
        if self.w1_scale is not None:
            self.w1_scale = self.w1_scale.to(device=device)
        if self.w2_scale is not None:
            self.w2_scale = self.w2_scale.to(device=device)
317

318
        if self.w1_gs is not None:
319
320
321
            self.w1_gs = self.w1_gs.to(device=device)
        if self.w2_gs is not None:
            self.w2_gs = self.w2_gs.to(device=device)
322

323
    def slice_weights(self, rank: int, num_local_experts: int) -> "WeightTensors":
324
325
326
327
        s = rank * num_local_experts
        e = s + num_local_experts
        w1 = self.w1[s:e, :, :]
        w2 = self.w2[s:e, :, :]
328
329
        w1_scale = self.w1_scale[s:e, :, :] if self.w1_scale is not None else None
        w2_scale = self.w2_scale[s:e, :, :] if self.w2_scale is not None else None
330
331
        w1_gs = self.w1_gs[s:e] if self.w1_gs is not None else None
        w2_gs = self.w2_gs[s:e] if self.w2_gs is not None else None
332

333
        return WeightTensors(w1, w2, w1_scale, w2_scale, w1_gs, w2_gs)
334

335
336
337
    @staticmethod
    def make(config: Config) -> "WeightTensors":
        (_, w1, w1_scale, w1_gs), (_, w2, w2_scale, w2_gs) = make_test_weights(
338
339
340
            e=config.E,
            n=config.N,
            k=config.K,
341
342
343
            in_dtype=config.dtype,
            quant_dtype=config.quant_dtype,
            block_shape=config.quant_block_shape,
344
345
            # or config.is_per_out_ch_quant
            per_out_ch_quant=config.is_per_act_token_quant,
346
347
348
        )
        return WeightTensors(
            w1=w1, w2=w2, w1_scale=w1_scale, w2_scale=w2_scale, w1_gs=w1_gs, w2_gs=w2_gs
349
350
351
352
353
354
        )


@dataclass
class RankTensors:
    hidden_states: torch.Tensor
355
    hidden_states_scale: torch.Tensor | None
356
357
358

    topk_weights: torch.Tensor
    topk_ids: torch.Tensor
359
    expert_map: torch.Tensor | None
360
361
362
363

    def describe(self):
        s = ""
        s += "== Rank Tensors: \n"
364
365
366
367
368
        s += f" - {_describe_tensor(self.hidden_states, 'HS')} \n"
        s += f" - {_describe_tensor(self.hidden_states_scale, 'HS_scale')} \n"
        s += f" - {_describe_tensor(self.topk_weights, 'topk_weights')} \n"
        s += f" - {_describe_tensor(self.topk_ids, 'topk_ids')} \n"
        s += f" - {_describe_tensor(self.expert_map, 'expert_map')} \n"
369
370
371
372
        return s

    @staticmethod
    def make_hidden_states(
373
        config: Config,
374
    ) -> tuple[torch.Tensor, torch.Tensor | None]:
375
376
377
378
        """
        Return hidden_states
        """
        m, k, dtype = (config.M, config.K, config.dtype)
379
        a = torch.randn((m, k), device=torch.cuda.current_device(), dtype=dtype) / 15.0
380
381
382
383
384
385
386

        if config.quant_dtype is None:
            return a, None

        # We dequant and use that as hidden_states so the tests are stable.
        # quantizing and dequantizing yield slightly different results
        # depending on the hardware. Here we, quantize and dequantize
387
        # first - so further quantize and dequantize will yield the same
388
389
        # values.
        if config.is_per_tensor_act_quant:
390
            a_q, a_scales = ops.scaled_fp8_quant(a, use_per_token_if_dynamic=False)
391
392
393
            return a_q.float().mul(a_scales).to(dtype), a_scales

        if config.is_per_act_token_quant:
394
            a_q, a_scales = ops.scaled_fp8_quant(a, use_per_token_if_dynamic=True)
395
396
397
398
399
            return a_q.float().mul(a_scales).to(dtype), None

        assert config.quant_block_shape is not None
        block_k = config.quant_block_shape[1]
        a_q, a_scales = per_token_cast_to_fp8(a, block_size=block_k)
400
401
402
        return a_q.float().view((-1, block_k)).mul(a_scales.view(-1, 1)).view(m, k).to(
            dtype
        ), None
403
404
405
406
407

    @staticmethod
    def make(config: Config, pgi: ProcessGroupInfo):
        dtype = config.dtype
        topk, m, _ = (config.topk, config.M, config.K)
408
        hidden_states, hidden_states_scale = RankTensors.make_hidden_states(config)
409

410
411
412
        num_local_experts, global_num_experts = (config.num_local_experts, config.E)
        score = torch.randn((m, global_num_experts), device="cuda", dtype=dtype)
        topk_weights, topk_ids, _ = fused_topk(hidden_states, score, topk, False)
413
414
415
416
417
418
419

        # distribute topk_ids evenly
        for mi in range(m):
            topk_ids[mi] = torch.randperm(config.E)[:topk]
        topk_ids = topk_ids.to(device=torch.cuda.current_device())

        expert_map = None
420
        if config.world_size > 1 and config.supports_expert_map():
421
422
423
            expert_map = torch.full(
                (global_num_experts,), fill_value=-1, dtype=torch.int32
            )
424
425
426
            s = pgi.rank * num_local_experts
            e = s + num_local_experts
            expert_map[s:e] = torch.tensor(list(range(num_local_experts)))
427
428
429
            expert_map = expert_map.to(
                device=torch.cuda.current_device(), dtype=torch.int32
            )
430
431
432
433
434
435
436
437
438
439

        return RankTensors(
            hidden_states=hidden_states,
            hidden_states_scale=hidden_states_scale,
            topk_weights=topk_weights,
            topk_ids=topk_ids,
            expert_map=expert_map,
        )


440
441
442
def reference_moe_impl(
    config: Config, weights: WeightTensors, rank_tensors: RankTensors
) -> torch.Tensor:
443
444
445
446
447
448
449
450
451
452
453
454
    if config.quant_dtype == "nvfp4":
        quant_blocksize = 16
        dtype = config.dtype

        w1_q = weights.w1
        w1_blockscale = weights.w1_scale
        w1_gs = weights.w1_gs

        w2_q = weights.w2
        w2_blockscale = weights.w2_scale
        w2_gs = weights.w2_gs

455
456
457
458
        a_global_scale = (
            (FLOAT8_E4M3_MAX * FLOAT4_E2M1_MAX)
            / torch.amax(rank_tensors.hidden_states.flatten(), dim=-1)
        ).to(torch.float32)
459
460
461
462
463
464
465
466
467
468
469
470

        assert w1_gs is not None
        assert w2_gs is not None
        assert w1_blockscale is not None
        assert w2_blockscale is not None

        assert w1_blockscale.shape[1] % 128 == 0
        assert w1_blockscale.shape[2] % 4 == 0
        assert w2_blockscale.shape[1] % 128 == 0
        assert w2_blockscale.shape[2] % 4 == 0

        a_fp4, a_scale_interleaved = ops.scaled_fp4_quant(
471
472
            rank_tensors.hidden_states, a_global_scale
        )
473

474
475
476
477
478
479
480
481
        a = dequantize_nvfp4_to_dtype(
            a_fp4,
            a_scale_interleaved,
            a_global_scale,
            dtype=dtype,
            device=a_fp4.device,
            block_size=quant_blocksize,
        )
482
483
484
485
486
487
488
489
490

        e = w1_q.shape[0]
        n = w1_q.shape[1] // 2
        k = w2_q.shape[1]

        w1 = torch.zeros((e, 2 * n, k), device="cuda", dtype=dtype)
        w2 = torch.zeros((e, k, n), device="cuda", dtype=dtype)

        for idx in range(0, e):
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
            w1[idx] = dequantize_nvfp4_to_dtype(
                w1_q[idx],
                w1_blockscale[idx],
                w1_gs[idx],
                dtype=dtype,
                device=w1_q.device,
                block_size=quant_blocksize,
            )
            w2[idx] = dequantize_nvfp4_to_dtype(
                w2_q[idx],
                w2_blockscale[idx],
                w2_gs[idx],
                dtype=dtype,
                device=w2_q.device,
                block_size=quant_blocksize,
            )
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
        a_scale = None
        w1_scale = None
        w2_scale = None
        quant_dtype = None
        per_act_token_quant = False
        block_shape = None
    else:
        a = rank_tensors.hidden_states
        a_scale = rank_tensors.hidden_states_scale
        w1 = weights.w1
        w1_scale = weights.w1_scale
        w2 = weights.w2
        w2_scale = weights.w2_scale
        quant_dtype = config.quant_dtype
        per_act_token_quant = config.is_per_act_token_quant
        block_shape = config.quant_block_shape

524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
    return torch_experts(
        a=a,
        w1=w1,
        w2=w2,
        topk_weight=rank_tensors.topk_weights,
        topk_ids=rank_tensors.topk_ids,
        global_num_experts=config.E,
        expert_map=None,
        w1_scale=w1_scale,
        w2_scale=w2_scale,
        a1_scale=a_scale,
        quant_dtype=quant_dtype,
        per_act_token_quant=per_act_token_quant,
        block_shape=block_shape,
        apply_router_weights_on_input=config.topk == 1
        and config.supports_apply_weight_on_input(),
    )
541
542


543
def _make_gscale(num_experts: int) -> torch.Tensor:
544
545
546
    return torch.ones(
        (num_experts,), device=torch.cuda.current_device(), dtype=torch.float32
    )
547
548


549
550
551
def make_modular_kernel(
    config: Config,
    vllm_config: VllmConfig,
552
    quant_config: FusedMoEQuantConfig,
553
) -> mk.FusedMoEModularKernel:
554
555
    def next_power_of_2(x):
        import math
556

557
558
        if x == 0:
            return 1
559
        return 2 ** math.ceil(math.log2(x))
560
561
562
563
564
565
566

    # make moe config
    moe_parallel_config: FusedMoEParallelConfig = FusedMoEParallelConfig.make(
        tp_size_=get_tensor_model_parallel_world_size(),
        dp_size_=get_dp_group().world_size,
        vllm_parallel_config=vllm_config.parallel_config,
    )
567

568
569
570
571
572
573
574
575
576
577
578
    moe = FusedMoEConfig(
        num_experts=config.E,
        experts_per_token=config.topk,
        hidden_dim=config.K,
        num_local_experts=config.num_local_experts,
        moe_parallel_config=moe_parallel_config,
        in_dtype=config.dtype,
        max_num_tokens=next_power_of_2(config.M),
    )

    # make modular kernel
579
580
581
    prepare_finalize = make_prepare_finalize(
        config.prepare_finalize_type, config.all2all_backend(), moe, quant_config
    )
582
583
584
585

    fused_experts = make_fused_experts(
        config.fused_experts_type,
        moe,
586
        quant_config,
587
        prepare_finalize.num_dispatchers(),
588
        config.N,
589
    )
590
591

    modular_kernel = mk.FusedMoEModularKernel(
592
593
        prepare_finalize=prepare_finalize, fused_experts=fused_experts
    )
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610

    return modular_kernel


def run_modular_kernel(
    pgi: ProcessGroupInfo,
    vllm_config: VllmConfig,
    config: Config,
    weights: WeightTensors,
    rank_tensors: RankTensors,
) -> torch.Tensor:
    assert isinstance(config.Ms, int)
    assert isinstance(config.topks, int)

    # weights for rank
    rank_weights = weights.slice_weights(pgi.rank, config.num_local_experts)

611
612
613
614
615
616
617
618
619
620
    if config.quant_dtype == "nvfp4":
        gscale = _make_gscale(config.num_local_experts)
    else:
        gscale = None

    quant_config = FusedMoEQuantConfig.make(
        config.quant_dtype,
        w1_scale=rank_weights.w1_scale,
        w2_scale=rank_weights.w2_scale,
        a1_scale=rank_tensors.hidden_states_scale,
621
622
        g1_alphas=(1 / rank_weights.w1_gs) if rank_weights.w1_gs is not None else None,
        g2_alphas=(1 / rank_weights.w2_gs) if rank_weights.w2_gs is not None else None,
623
624
625
626
627
628
629
630
631
632
633
634
        a1_gscale=gscale,
        a2_gscale=gscale,
        block_shape=config.quant_block_shape,
        per_act_token_quant=config.is_per_act_token_quant,
        per_out_ch_quant=config.is_per_out_ch_quant,
    )

    mk = make_modular_kernel(config, vllm_config, quant_config)

    # impls might update the tensor in place
    hidden_states = rank_tensors.hidden_states.clone()

635
    topk_ids = rank_tensors.topk_ids.to(mk.prepare_finalize.topk_indices_dtype())
636
637

    mk_kwargs = {
638
639
640
641
642
643
644
645
646
        "hidden_states": hidden_states,
        "w1": rank_weights.w1,
        "w2": rank_weights.w2,
        "topk_weights": rank_tensors.topk_weights,
        "topk_ids": topk_ids,
        "expert_map": rank_tensors.expert_map,
        "global_num_experts": config.E,
        "apply_router_weight_on_input": config.topk == 1
        and config.supports_apply_weight_on_input(),
647
    }
648
649

    num_tokens = rank_tensors.hidden_states.shape[0]
650
651
652
    num_tokens_across_dp = torch.tensor(
        [num_tokens] * config.world_size, device="cuda", dtype=torch.int
    )
653
654

    with set_forward_context(
655
656
657
658
        None,
        vllm_config,
        num_tokens=num_tokens,
        num_tokens_across_dp=num_tokens_across_dp,
659
660
    ):
        out = mk.forward(**mk_kwargs)
661
662

    return out