Integrate Marlin Kernels for Int4 GPTQ inference (#2497)

Co-authored-by: Robert Shaw <114415538+rib-2@users.noreply.github.com>
Co-authored-by: alexm <alexm@neuralmagic.com>

csrc/ops.h

@@ -84,6 +84,15 @@ torch::Tensor awq_dequantize(
     int split_k_iters,
     int thx,
     int thy);
+
+torch::Tensor marlin_gemm(
+    torch::Tensor& a, 
+    torch::Tensor& b_q_weight,
+    torch::Tensor& b_scales, 
+    torch::Tensor& workspace,
+    int64_t size_m, 
+    int64_t size_n, 
+    int64_t size_k);
 #endif
 
 void squeezellm_gemm(

csrc/pybind.cpp

@@ -52,11 +52,13 @@ PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
     &rotary_embedding,
     "Apply GPT-NeoX or GPT-J style rotary embedding to query and key");
 
-  // Quantization ops
+// Quantization ops
 #ifndef USE_ROCM
   ops.def("awq_gemm", &awq_gemm, "Quantized GEMM for AWQ");
+  ops.def("marlin_gemm", &marlin_gemm, "Marlin Optimized Quantized GEMM for GPTQ");
   ops.def("awq_dequantize", &awq_dequantize, "Dequantization for AWQ");
 #endif
+ 
   ops.def("gptq_gemm", &gptq_gemm, "Quantized GEMM for GPTQ");
   ops.def("gptq_shuffle", &gptq_shuffle, "Post processing for GPTQ");
   ops.def("squeezellm_gemm", &squeezellm_gemm, "Quantized GEMM for SqueezeLLM");

csrc/quantization/marlin/LICENSE

+Contains code from https://github.com/IST-DASLab/marlin
+
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requirements-dev.txt

@@ -15,6 +15,7 @@ types-setuptools
 pytest
 pytest-forked
 pytest-asyncio
+pytest-rerunfailures
 httpx
 einops # required for MPT
 openai

setup.py

@@ -342,6 +342,8 @@ vllm_extension_sources = [
 
 if _is_cuda():
     vllm_extension_sources.append("csrc/quantization/awq/gemm_kernels.cu")
+    vllm_extension_sources.append(
+        "csrc/quantization/marlin/marlin_cuda_kernel.cu")
     vllm_extension_sources.append("csrc/custom_all_reduce.cu")
 
     # Add MoE kernels.

tests/conftest.py

@@ -199,6 +199,24 @@ class VllmRunner:
             outputs.append((req_sample_output_ids, req_sample_output_strs))
         return outputs
 
+    def generate_w_logprobs(
+        self,
+        prompts: List[str],
+        sampling_params: SamplingParams,
+    ) -> List[Tuple[List[int], str]]:
+        assert sampling_params.logprobs is not None
+
+        req_outputs = self.model.generate(prompts,
+                                          sampling_params=sampling_params)
+        outputs = []
+        for req_output in req_outputs:
+            for sample in req_output.outputs:
+                output_str = sample.text
+                output_ids = sample.token_ids
+                output_logprobs = sample.logprobs
+            outputs.append((output_ids, output_str, output_logprobs))
+        return outputs
+
     def generate_greedy(
         self,
         prompts: List[str],
@@ -209,6 +227,20 @@ class VllmRunner:
         return [(output_ids[0], output_str[0])
                 for output_ids, output_str in outputs]
 
+    def generate_greedy_logprobs(
+        self,
+        prompts: List[str],
+        max_tokens: int,
+        num_logprobs: int,
+    ) -> List[Tuple[List[int], str]]:
+        greedy_logprobs_params = SamplingParams(temperature=0.0,
+                                                max_tokens=max_tokens,
+                                                logprobs=num_logprobs)
+        outputs = self.generate_w_logprobs(prompts, greedy_logprobs_params)
+
+        return [(output_ids, output_str, output_logprobs)
+                for output_ids, output_str, output_logprobs in outputs]
+
     def generate_beam_search(
         self,
         prompts: List[str],

tests/models/test_marlin.py

+"""Compare the outputs of a GPTQ model to a Marlin model.
+
+Note: GPTQ and Marlin do not have bitwise correctness. 
+As a result, in this test, we just confirm that the top selected tokens of the 
+Marlin/GPTQ models are in the top 3 selections of each other.
+
+Note: Marlin internally uses locks to synchronize the threads. This can
+result in very slight nondeterminism for Marlin. As a result, we re-run the test
+up to 3 times to see if we pass.
+
+Run `pytest tests/models/test_marlin.py --forked`.
+"""
+
+import pytest
+import torch
+from dataclasses import dataclass
+from vllm.model_executor.layers.quantization import _QUANTIZATION_CONFIG_REGISTRY
+
+capability = torch.cuda.get_device_capability()
+capability = capability[0] * 10 + capability[1]
+marlin_not_supported = (
+    capability < _QUANTIZATION_CONFIG_REGISTRY["marlin"].get_min_capability())
+
+
+@dataclass
+class ModelPair:
+    model_marlin: str
+    model_gptq: str
+
+
+model_pairs = [
+    ModelPair(model_marlin="nm-testing/zephyr-beta-7b-marlin-g128",
+              model_gptq="nm-testing/zephyr-beta-7b-gptq-g128"),
+    ModelPair(model_marlin="robertgshaw2/zephyr-7b-beta-channelwise-marlin",
+              model_gptq="robertgshaw2/zephyr-7b-beta-channelwise-gptq"),
+    ModelPair(model_marlin="robertgshaw2/TinyLlama-1.1B-Chat-v1.0-g128-marlin",
+              model_gptq="robertgshaw2/TinyLlama-1.1B-Chat-v1.0-g128-gptq")
+]
+
+
+@pytest.mark.flaky(reruns=2)
+@pytest.mark.skipif(marlin_not_supported,
+                    reason="Marlin is not supported on this GPU type.")
+@pytest.mark.parametrize("model_pair", model_pairs)
+@pytest.mark.parametrize("dtype", ["half"])
+@pytest.mark.parametrize("max_tokens", [32])
+@pytest.mark.parametrize("num_logprobs", [3])
+def test_models(
+    vllm_runner,
+    example_prompts,
+    model_pair: ModelPair,
+    dtype: str,
+    max_tokens: int,
+    num_logprobs: int,
+) -> None:
+    marlin_model = vllm_runner(model_pair.model_marlin, dtype=dtype)
+    marlin_outputs = marlin_model.generate_greedy_logprobs(
+        example_prompts, max_tokens, num_logprobs)
+
+    # Note: not sure why, but deleting just the model on Ada Lovelace
+    #   does not free the GPU memory. On Ampere, deleting the just model
+    #   frees the memory.
+    del marlin_model.model.llm_engine.driver_worker
+    del marlin_model
+
+    gptq_model = vllm_runner(model_pair.model_gptq, dtype=dtype)
+    gptq_outputs = gptq_model.generate_greedy_logprobs(example_prompts,
+                                                       max_tokens,
+                                                       num_logprobs)
+
+    # Note: not sure why, but deleting just the model on Ada Lovelace
+    #   does not free the GPU memory. On Ampere, deleting the just model
+    #   frees the memory.
+    del gptq_model.model.llm_engine.driver_worker
+    del gptq_model
+
+    # loop through the prompts
+    for prompt_idx in range(len(example_prompts)):
+        gptq_output_ids, gptq_output_str, gptq_logprobs = gptq_outputs[
+            prompt_idx]
+        marlin_output_ids, marlin_output_str, marlin_logprobs = marlin_outputs[
+            prompt_idx]
+
+        for idx, (gptq_output_id, marlin_output_id) in enumerate(
+                zip(gptq_output_ids, marlin_output_ids)):
+            # If sequence is not an exact match,
+            if marlin_output_id != gptq_output_id:
+                # Each predicted token must be in top 5 of the other's
+                assert gptq_output_id in marlin_logprobs[idx], (
+                    f"Test{prompt_idx}:\nGPTQ:\t{gptq_output_str!r}\nMarlin:\t{marlin_output_str!r}"
+                )
+                assert marlin_output_id in gptq_logprobs[idx], (
+                    f"Test{prompt_idx}:\nGPTQ:\t{gptq_output_str!r}\nMarlin:\t{marlin_output_str!r}"
+                )
+
+                # Break out since sequences will now diverge.
+                break

vllm/config.py

@@ -155,15 +155,21 @@ class ModelConfig:
         self.tokenizer_mode = tokenizer_mode
 
     def _verify_quantization(self) -> None:
-        supported_quantization = ["awq", "gptq", "squeezellm"]
-        rocm_not_supported_quantization = ["awq"]
+        supported_quantization = ["awq", "gptq", "squeezellm", "marlin"]
+        rocm_not_supported_quantization = ["awq", "marlin"]
         if self.quantization is not None:
             self.quantization = self.quantization.lower()
 
         # Parse quantization method from the HF model config, if available.
         hf_quant_config = getattr(self.hf_config, "quantization_config", None)
         if hf_quant_config is not None:
+
             hf_quant_method = str(hf_quant_config["quant_method"]).lower()
+            # If the GPTQ model is serialized in marlin format, use marlin.
+            if (hf_quant_method == "gptq"
+                    and "is_marlin_format" in hf_quant_config
+                    and hf_quant_config["is_marlin_format"]):
+                hf_quant_method = "marlin"
             if self.quantization is None:
                 self.quantization = hf_quant_method
             elif self.quantization != hf_quant_method:
@@ -183,7 +189,9 @@ class ModelConfig:
                 raise ValueError(
                     f"{self.quantization} quantization is currently not supported "
                     f"in ROCm.")
-            logger.warning(f"{self.quantization} quantization is not fully "
+            if self.quantization != "marlin":
+                logger.warning(
+                    f"{self.quantization} quantization is not fully "
                     "optimized yet. The speed can be slower than "
                     "non-quantized models.")
 

vllm/model_executor/layers/linear.py

@@ -17,6 +17,14 @@ from vllm.logger import init_logger
 logger = init_logger(__name__)
 
 
+def adjust_marlin_shard(param, shard_size, shard_offset):
+    marlin_tile_size = getattr(param, "marlin_tile_size", None)
+    if marlin_tile_size is None:
+        return shard_size, shard_offset
+
+    return shard_size * marlin_tile_size, shard_offset * marlin_tile_size
+
+
 class LinearMethodBase(ABC):
     """Base class for different (maybe quantized) linear methods."""
 
@@ -276,6 +284,11 @@ class MergedColumnParallelLinear(ColumnParallelLinear):
                 if packed_dim == output_dim:
                     shard_size = shard_size // param.pack_factor
                     shard_offset = shard_offset // param.pack_factor
+
+                    # If marlin, we need to adjust the offset and size to account for the tiling.
+                    shard_size, shard_offset = adjust_marlin_shard(
+                        param, shard_size, shard_offset)
+
                 loaded_weight_shard = loaded_weight.narrow(
                     output_dim, shard_offset, shard_size)
                 self.weight_loader(param, loaded_weight_shard, shard_id)
@@ -293,6 +306,11 @@ class MergedColumnParallelLinear(ColumnParallelLinear):
             if packed_dim == output_dim:
                 shard_size = shard_size // param.pack_factor
                 shard_offset = shard_offset // param.pack_factor
+
+                # If marlin, we need to adjust the offset and size to account for the tiling.
+                shard_size, shard_offset = adjust_marlin_shard(
+                    param, shard_size, shard_offset)
+
             param_data = param_data.narrow(output_dim, shard_offset,
                                            shard_size)
             start_idx = tp_rank * shard_size
@@ -372,6 +390,7 @@ class QKVParallelLinear(ColumnParallelLinear):
                       loaded_shard_id: Optional[str] = None):
         param_data = param.data
         output_dim = getattr(param, "output_dim", None)
+
         if loaded_shard_id is None:
             # Loaded weight is already packed.
             if output_dim is None:
@@ -393,6 +412,11 @@ class QKVParallelLinear(ColumnParallelLinear):
                 if packed_dim == output_dim:
                     shard_size = shard_size // param.pack_factor
                     shard_offset = shard_offset // param.pack_factor
+
+                    # If marlin, we need to adjust the offset and size to account for the tiling.
+                    shard_size, shard_offset = adjust_marlin_shard(
+                        param, shard_size, shard_offset)
+
                 loaded_weight_shard = loaded_weight.narrow(
                     output_dim, shard_offset, shard_size)
                 self.weight_loader(param, loaded_weight_shard, shard_id)
@@ -417,6 +441,11 @@ class QKVParallelLinear(ColumnParallelLinear):
             if packed_dim == output_dim:
                 shard_size = shard_size // param.pack_factor
                 shard_offset = shard_offset // param.pack_factor
+
+                # If marlin, we need to adjust the offset and size to account for the tiling.
+                shard_size, shard_offset = adjust_marlin_shard(
+                    param, shard_size, shard_offset)
+
             param_data = param_data.narrow(output_dim, shard_offset,
                                            shard_size)
             if loaded_shard_id == "q":

vllm/model_executor/layers/quantization/__init__.py

@@ -4,11 +4,13 @@ from vllm.model_executor.layers.quantization.base_config import QuantizationConf
 from vllm.model_executor.layers.quantization.awq import AWQConfig
 from vllm.model_executor.layers.quantization.gptq import GPTQConfig
 from vllm.model_executor.layers.quantization.squeezellm import SqueezeLLMConfig
+from vllm.model_executor.layers.quantization.marlin import MarlinConfig
 
 _QUANTIZATION_CONFIG_REGISTRY = {
     "awq": AWQConfig,
     "gptq": GPTQConfig,
     "squeezellm": SqueezeLLMConfig,
+    "marlin": MarlinConfig,
 }
 
 

vllm/model_executor/layers/quantization/marlin.py

+from typing import Any, Dict, List, Optional
+
+import torch
+from torch.nn.parameter import Parameter
+
+from vllm._C import ops
+from vllm.model_executor.layers.linear import LinearMethodBase, set_weight_attrs
+from vllm.model_executor.layers.quantization.base_config import QuantizationConfig
+
+
+class MarlinConfig(QuantizationConfig):
+    """Config class for Marlin.
+
+    Reference: https://github.com/IST-DASLab/marlin/tree/master
+    """
+
+    def __init__(
+        self,
+        group_size: int,
+    ) -> None:
+        # Group size for the quantization.
+        self.group_size = group_size
+        if self.group_size != 128 and self.group_size != -1:
+            raise ValueError(
+                "Currently, only group size 128 and -1 (channelwise) is supported for "
+                f"Marlin, but got group_size of {self.group_size}")
+
+        # 4 Bits packed into 32 bit datatype.
+        self.pack_factor = 32 // 4
+
+        # Tile size used by marlin kernels.
+        self.tile_size = 16
+
+        # Min out_features dim
+        self.min_n_threads = 64
+
+        # Min in_features dim
+        self.min_k_threads = 128
+
+        # Max parallel problems to solve at once (improves large batch performance)
+        self.max_parallel = 16
+
+        # Permutation length used by the marlin kernels.
+        self.perm_len = 1024
+
+    def __repr__(self) -> str:
+        return f"MarlinConfig(group_size={self.group_size}"
+
+    @classmethod
+    def get_name(cls) -> str:
+        return "marlin"
+
+    @classmethod
+    def get_supported_act_dtypes(cls) -> List[torch.dtype]:
+        return [torch.half]
+
+    @classmethod
+    # Need to figure it out
+    def get_min_capability(cls) -> int:
+        return 80
+
+    @classmethod
+    def get_config_filenames(cls) -> List[str]:
+        return ["quantize_config.json"]
+
+    @classmethod
+    def from_config(cls, config: Dict[str, Any]) -> "MarlinConfig":
+        group_size = cls.get_from_keys(config, ["group_size"])
+        return cls(group_size)
+
+    def get_linear_method(self) -> "MarlinLinearMethod":
+        return MarlinLinearMethod(self)
+
+    def get_scaled_act_names(self) -> List[str]:
+        return []
+
+
+class MarlinLinearMethod(LinearMethodBase):
+    """Linear method for Marlin.
+
+    Args:
+        quant_config: The Marlin quantization config.
+    """
+
+    def __init__(self, quant_config: MarlinConfig):
+        self.quant_config = quant_config
+
+    def create_weights(
+        self,
+        input_size_per_partition: int,
+        output_size_per_partition: int,
+        input_size: int,
+        output_size: int,
+        params_dtype: torch.dtype,
+    ) -> Dict[str, Any]:
+        del output_size  # Unused.
+
+        if params_dtype != torch.float16:
+            raise ValueError(
+                f"The params dtype must be float16, but got {params_dtype}")
+
+        # Validate output_size_per_partition
+        if output_size_per_partition % self.quant_config.min_n_threads != 0:
+            raise ValueError(
+                f"Weight output_size_per_partition = {output_size_per_partition} is not divisible by min_n_threads = {self.quant_config.min_n_threads}."
+            )
+        if output_size_per_partition % self.quant_config.pack_factor != 0:
+            raise ValueError(
+                f"Weight output_size_per_partition = {output_size_per_partition} is not divisible by pack_factor = {self.quant_config.pack_factor}."
+            )
+
+        # Validate input_size_per_partition
+        if input_size_per_partition % self.quant_config.min_k_threads != 0:
+            raise ValueError(
+                f"Weight input_size_per_partition = {input_size_per_partition} is not divisible by min_k_threads = {self.quant_config.min_k_threads}."
+            )
+        if self.quant_config.group_size != -1 and input_size_per_partition % self.quant_config.group_size != 0:
+            raise ValueError(
+                f"Weight input_size_per_partition = f{input_size_per_partition} is not divisible by group_size = {self.quant_config.group_size}."
+            )
+
+        # Check that we have at least 4 tiles horizontally in the shard
+        num_tiles_per_perm = self.quant_config.perm_len // (
+            self.quant_config.tile_size**2)
+        if output_size_per_partition % num_tiles_per_perm != 0:
+            raise ValueError(
+                "Each permutation group must reside on the same gpu")
+
+        # Quantized 4Bit weights packed into Int32.
+        qweight = Parameter(
+            torch.empty(
+                input_size_per_partition // self.quant_config.tile_size,
+                output_size_per_partition * self.quant_config.tile_size //
+                self.quant_config.pack_factor,
+                device="cuda",
+                dtype=torch.int32,
+            ),
+            requires_grad=False,
+        )
+        set_weight_attrs(
+            qweight,
+            {
+                "input_dim": 0,
+                "output_dim": 1,
+                "packed_dim": 1,
+                "pack_factor": self.quant_config.pack_factor,
+                "marlin_tile_size": self.quant_config.tile_size,
+            },
+        )
+
+        # Determine if channelwise or not
+        input_groups = 1 if self.quant_config.group_size == -1 else input_size_per_partition // self.quant_config.group_size
+
+        scales = Parameter(
+            torch.empty(
+                input_groups,
+                output_size_per_partition,
+                device="cuda",
+                dtype=params_dtype,
+            ),
+            requires_grad=False,
+        )
+        set_weight_attrs(
+            scales,
+            {
+                "input_dim": None if input_groups == 1 else 0,
+                "output_dim": 1,
+            },
+        )
+
+        # Allocate workspace (Used for internal locking mechanism)
+        max_workspace_size = (
+            output_size_per_partition //
+            self.quant_config.min_n_threads) * self.quant_config.max_parallel
+        workspace = Parameter(torch.zeros(max_workspace_size,
+                                          device="cuda",
+                                          dtype=torch.int),
+                              requires_grad=False)
+
+        return {
+            "B": qweight,
+            "s": scales,
+            "workspace": workspace,
+        }
+
+    def apply_weights(
+        self,
+        weights: Dict[str, Any],
+        x: torch.Tensor,
+        bias: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        qweight = weights["B"]
+        scales = weights["s"]
+        workspace = weights["workspace"]
+
+        x_2d = x.view(-1, x.shape[-1])
+
+        size_m = x_2d.shape[0]
+        size_k = x_2d.shape[1]
+        size_n = scales.shape[1]
+
+        output_2d = ops.marlin_gemm(x_2d, qweight, scales, workspace, size_m,
+                                    size_n, size_k)
+
+        output = output_2d.view(x.shape[:-1] + (output_2d.shape[1], ))
+
+        if bias is not None:
+            output.add_(bias)  # In-place add
+
+        return output