[Kernel] Support Fp8 Checkpoints (Dynamic + Static) (vllm-project#4332)

Co-authored-by: Philipp Moritz <[email protected]>
Co-authored-by: Woosuk Kwon <[email protected]>
Co-authored-by: mgoin <[email protected]>
Co-authored-by: Tyler Michael Smith <[email protected]>
Co-authored-by: Cody Yu <[email protected]>

Author: 6 people

tests/models/test_fp8.py

@@ -0,0 +1,90 @@
+# flake8: noqa
+"""Tests fp8 models against ground truth generation
+Note: these tests will only pass on L4 GPU.
+"""
+import os
+
+import pytest
+import torch
+from transformers import AutoTokenizer
+
+from vllm import LLM, SamplingParams
+from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
+
+os.environ["TOKENIZERS_PARALLELISM"] = "true"
+
+MAX_MODEL_LEN = 1024
+
+MODELS = [
+    "nm-testing/Meta-Llama-3-8B-Instruct-FP8",
+    "meta-llama/Meta-Llama-3-8B-Instruct",
+]
+
+EXPECTED_STRS_MAP = {
+    "nm-testing/Meta-Llama-3-8B-Instruct-FP8": [
+        'LLaMA is a high-throughput and memory-efficient inference and serving engine for Large Language Models (',
+        'Here are the major milestones in the development of artificial intelligence (AI) from 1950 to ',
+        'Artificial intelligence (AI) and human intelligence (HI) differ significantly in how they process information.',
+        'A neural network is a complex system modeled after the human brain, composed of interconnected nodes or "ne',
+        'Zeta-5, a highly advanced robot designed for menial labor, whirred and beep',
+        'The COVID-19 pandemic has had a profound impact on global economic structures and future business models. Here',
+        'The Mona Lisa, painted by Leonardo da Vinci in the early 16th century, is one of',
+        'Here are the translations:\n\n**Japanese:** (Haya tori, nemuri nemuri)\n\n**'
+    ],
+    "meta-llama/Meta-Llama-3-8B-Instruct": [
+        'LLM (Large Language Model) is a type of artificial intelligence (AI) model that is trained',
+        'Here are the major milestones in the development of artificial intelligence (AI) from 1950 to ',
+        'Artificial intelligence (AI) and human intelligence (HI) differ significantly in how they process information.',
+        'A neural network is a complex system modeled after the human brain, composed of interconnected nodes or "ne',
+        'In the year 2154, the robotics lab at NeuroSpark Industries was on the cusp of',
+        'The COVID-19 pandemic has had a profound impact on global economic structures and future business models. The',
+        'The Mona Lisa, painted by Leonardo da Vinci in the early 16th century, is one of',
+        'Here are the translations:\n\n**Japanese:** (Haya aki wa mushi o tsukamu'
+    ],
+}
+
+capability = torch.cuda.get_device_capability()
+capability = capability[0] * 10 + capability[1]
+fp8_not_supported = (capability <
+                     QUANTIZATION_METHODS["fp8"].get_min_capability())
+
+
+@pytest.mark.skipif(fp8_not_supported,
+                    reason="fp8 is not supported on this GPU type.")
+@pytest.mark.parametrize("model_name", MODELS)
+def test_models(
+    example_prompts,
+    model_name,
+) -> None:
+    model = LLM(model=model_name,
+                max_model_len=MAX_MODEL_LEN,
+                enforce_eager=True,
+                quantization="fp8")
+
+    tokenizer = AutoTokenizer.from_pretrained(model_name)
+    formatted_prompts = [
+        tokenizer.apply_chat_template([{
+            "role": "user",
+            "content": prompt
+        }],
+                                      tokenize=False,
+                                      add_generation_prompt=True)
+        for prompt in example_prompts
+    ]
+
+    params = SamplingParams(max_tokens=20, temperature=0)
+    generations = []
+    # Note: these need to be run 1 at a time due to numerical precision,
+    # since the expected strs were generated this way.
+    for prompt in formatted_prompts:
+        outputs = model.generate(prompt, params)
+        generations.append(outputs[0].outputs[0].text)
+    del model
+
+    print(generations)
+    expected_strs = EXPECTED_STRS_MAP[model_name]
+    for i in range(len(example_prompts)):
+        generated_str = generations[i]
+        expected_str = expected_strs[i]
+        assert expected_str == generated_str, (
+            f"Test{i}:\nExpected: {expected_str!r}\nvLLM: {generated_str!r}")

vllm/model_executor/layers/linear.py

@@ -248,6 +248,10 @@ def __init__(
             self.register_parameter("bias", None)
 
     def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
+        # Special case for Fp8 scales.
+        fp8_scales_shard_indexer = getattr(param, "fp8_scales_shard_indexer",
+                                           None)
+
         tp_rank = get_tensor_model_parallel_rank()
         output_dim = getattr(param, "output_dim", None)
         param_data = param.data
@@ -256,6 +260,12 @@ def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
             start_idx = tp_rank * shard_size
             loaded_weight = loaded_weight.narrow(output_dim, start_idx,
                                                  shard_size)
+        # Special case for Fp8 scales.
+        elif fp8_scales_shard_indexer is not None:
+            param_data, loaded_weight = fp8_scales_shard_indexer(param_data,
+                                                                 loaded_weight,
+                                                                 shard_id=0)
+
         assert param_data.shape == loaded_weight.shape
         param_data.copy_(loaded_weight)
 
@@ -325,7 +335,12 @@ def weight_loader(self,
 
         param_data = param.data
         output_dim = getattr(param, "output_dim", None)
+        # Special case for AQLM codebooks.
         is_metadata = getattr(param, "is_metadata", False)
+        # Special case for Fp8 scales.
+        fp8_scales_shard_indexer = getattr(param, "fp8_scales_shard_indexer",
+                                           None)
+
         if loaded_shard_id is None:
             # Loaded weight is already packed.
             if output_dim is None:
@@ -339,14 +354,13 @@ def weight_loader(self,
                 current_shard_offset += output_size
             packed_dim = getattr(param, "packed_dim", None)
             for shard_id, shard_offset, shard_size in shard_offsets:
+                # Special case for Quantization.
                 # If quantized, we need to adjust the offset and size to account
                 # for the packing.
                 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.
+                    # Special case for Marlin.
                     shard_size, shard_offset = adjust_marlin_shard(
                         param, shard_size, shard_offset)
 
@@ -361,15 +375,14 @@ def weight_loader(self,
         if output_dim is not None:
             shard_offset = sum(self.output_sizes[:loaded_shard_id]) // tp_size
             shard_size = self.output_sizes[loaded_shard_id] // tp_size
+            # Special case for quantization.
             # If quantized, we need to adjust the offset and size to account
             # for the packing.
             packed_dim = getattr(param, "packed_dim", None)
             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.
+                # Special case for Marlin.
                 shard_size, shard_offset = adjust_marlin_shard(
                     param, shard_size, shard_offset)
 
@@ -378,11 +391,17 @@ def weight_loader(self,
             start_idx = tp_rank * shard_size
             loaded_weight = loaded_weight.narrow(output_dim, start_idx,
                                                  shard_size)
+        # Special case for AQLM codebooks.
         elif is_metadata:
             # metadata indicates fixed size concatenated along dim 0
             shard_size = loaded_weight.shape[0]
             shard_offset = loaded_shard_id * shard_size
             param_data = param_data.narrow(0, shard_offset, shard_size)
+        # Special case for Fp8 scales.
+        elif fp8_scales_shard_indexer is not None:
+            param_data, loaded_weight = fp8_scales_shard_indexer(
+                param_data, loaded_weight, loaded_shard_id)
+
         else:
             ignore_warning = getattr(param, "ignore_warning", False)
             if not ignore_warning:
@@ -477,7 +496,11 @@ def weight_loader(self,
                       loaded_shard_id: Optional[str] = None):
         param_data = param.data
         output_dim = getattr(param, "output_dim", None)
+        # Special case for AQLM codebooks.
         is_metadata = getattr(param, "is_metadata", False)
+        # Special case for Fp8 scales.
+        fp8_scales_shard_indexer = getattr(param, "fp8_scales_shard_indexer",
+                                           None)
 
         if loaded_shard_id is None:
             # Loaded weight is already packed.
@@ -495,14 +518,14 @@ def weight_loader(self,
             ]
             packed_dim = getattr(param, "packed_dim", None)
             for shard_id, shard_offset, shard_size in shard_offsets:
+                # Special case for Quantized Weights.
                 # If quantized, we need to adjust the offset and size to account
                 # for the packing.
                 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.
+                    # Special case for Marlin.
                     shard_size, shard_offset = adjust_marlin_shard(
                         param, shard_size, shard_offset)
 
@@ -524,15 +547,15 @@ def weight_loader(self,
                 shard_offset = (self.num_heads +
                                 self.num_kv_heads) * self.head_size
                 shard_size = self.num_kv_heads * self.head_size
+            # Special case for Quantized Weights.
             # If quantized, we need to adjust the offset and size to account
             # for the packing.
             packed_dim = getattr(param, "packed_dim", None)
             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.
+                # Special case for Marlin.
                 shard_size, shard_offset = adjust_marlin_shard(
                     param, shard_size, shard_offset)
 
@@ -545,12 +568,17 @@ def weight_loader(self,
             start_idx = shard_id * shard_size
             loaded_weight = loaded_weight.narrow(output_dim, start_idx,
                                                  shard_size)
+        # Special case for for AQLM codebooks.
         elif is_metadata:
             # metadata indicates fixed size concatenated along dim 0
             shard_size = loaded_weight.shape[0]
             shard_index = ["q", "k", "v"].index(loaded_shard_id)
             param_data = param_data.narrow(0, shard_index * shard_size,
                                            shard_size)
+        # Special case for Fp8 scales.
+        elif fp8_scales_shard_indexer is not None:
+            param_data, loaded_weight = fp8_scales_shard_indexer(
+                param_data, loaded_weight, loaded_shard_id)
         else:
             ignore_warning = getattr(param, "ignore_warning", False)
             if not ignore_warning:
@@ -642,6 +670,10 @@ def __init__(
             self.register_parameter("bias", None)
 
     def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
+        # Special case for Fp8 scales.
+        fp8_scales_shard_indexer = getattr(param, "fp8_scales_shard_indexer",
+                                           None)
+
         tp_rank = get_tensor_model_parallel_rank()
         input_dim = getattr(param, "input_dim", None)
         param_data = param.data
@@ -650,6 +682,12 @@ def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
             start_idx = tp_rank * shard_size
             loaded_weight = loaded_weight.narrow(input_dim, start_idx,
                                                  shard_size)
+        # Special case for Fp8 scales.
+        elif fp8_scales_shard_indexer is not None:
+            param_data, loaded_weight = fp8_scales_shard_indexer(param_data,
+                                                                 loaded_weight,
+                                                                 shard_id=0)
+
         assert param_data.shape == loaded_weight.shape
         param_data.copy_(loaded_weight)