add int4 gptq and eval (#116)

* add int4 gptq and eval

Summary: adding int4 gptq and eval support. Also fixed a few bugs
relating to quantizing the activation both during gptq calculation and
when calculating the output.

Test Plan: python test/quantization/test_quant_api.py

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ghstack-source-id: d29b6d7
Pull Request resolved: #115

* add int4 gptq and eval

Summary: adding int4 gptq and eval support. Also fixed a few bugs
relating to quantizing the activation both during gptq calculation and
when calculating the output.

Test Plan: python test/quantization/test_quant_api.py

Reviewers:

Subscribers:

Tasks:

Tags:

* remove debug from GPTQ

Summary:

Test Plan:

Reviewers:

Subscribers:

Tasks:

Tags:

Author: HDCharles

test/quantization/model.py

@@ -10,15 +10,15 @@
 import torch.nn as nn
 from torch import Tensor
 from torch.nn import functional as F
+from torchao.quantization.utils import find_multiple
 
-def prepare_inputs_for_model(inps):
+def prepare_inputs_for_model(inps, max_new_tokens=1):
     # this is because input from lm-eval is 2d
-    if input.dim() != 2:
-        raise ValueError(f"Expected input to be of dim 2, but got {input.dim()}")
+    if inps.dim() != 2:
+        raise ValueError(f"Expected input to be of dim 2, but got {inps.dim()}")
 
     inps = inps.squeeze(0)
     # setup inputs in correct format
-    max_new_tokens = 1
     T = inps.size(0)
     T_new = T + max_new_tokens
     seq = torch.empty(T_new, dtype=inps.dtype, device=inps.device)
@@ -27,11 +27,6 @@ def prepare_inputs_for_model(inps):
     x = seq.index_select(0, input_pos).view(1, -1)
     return (x, input_pos)
 
-def find_multiple(n: int, k: int) -> int:
-    if n % k == 0:
-        return n
-    return n + k - (n % k)
-
 @dataclass
 class ModelArgs:
     block_size: int = 2048

test/quantization/test_quant_api.py

@@ -151,8 +151,8 @@ def test_8da4w_quantizer(self):
         m(*example_inputs)
 
     @unittest.skip("skipping until we get checkpoints for gpt-fast")
-    def test_gptq_quantizer(self):
-        from torchao.quantization.GPTQ import Int8DynActInt4WeightGPTQQuantizer, InputRecorder
+    def test_8da4w_gptq_quantizer(self):
+        from torchao.quantization.GPTQ import Int8DynActInt4WeightGPTQQuantizer, InputRecorder, TransformerEvalWrapper
         # should be similar to TorchCompileDynamicQuantizer
         precision = torch.bfloat16
         device = "cpu"
@@ -161,6 +161,7 @@ def test_gptq_quantizer(self):
         checkpoint = torch.load(str(checkpoint_path), mmap=True, weights_only=True)
         model.load_state_dict(checkpoint, assign=True)
         model = model.to(dtype=precision, device=device)
+        model.eval()
         tokenizer_path = checkpoint_path.parent / "tokenizer.model"
         assert tokenizer_path.is_file(), tokenizer_path
         tokenizer = SentencePieceProcessor(  # pyre-ignore[28]
@@ -190,12 +191,60 @@ def test_gptq_quantizer(self):
             blocksize,
             percdamp,
             groupsize,
+            precision=precision,
         )
         model.setup_caches(max_batch_size=1, max_seq_length=calibration_seq_length)
         model = quantizer.quantize(model, inputs)
-        compiled = torch.compile(model, mode="max-autotune")
-        with torch.no_grad():
-            compiled(inputs[0].values[0], inputs[1].values[0])
+        result=TransformerEvalWrapper(
+            model,
+            tokenizer,
+            model.config.block_size,
+            prepare_inputs_for_model,
+            device,
+        ).run_eval(
+            ["wikitext"],
+            1,
+        )
+
+        assert result['results']['wikitext']['word_perplexity,none'] < 7.88, (
+            f"accuracy regressed from 7.87 to {result['results']['wikitext']['word_perplexity,none']}"
+        )
+
+    @unittest.skip("skipping until we get checkpoints for gpt-fast")
+    @unittest.skipIf(not TORCH_VERSION_AFTER_2_4, "skipping when torch verion is 2.4 or lower")
+    def test_8da4w_quantizer_eval(self):
+        from torchao.quantization.quant_api import Int8DynActInt4WeightQuantizer
+        from torchao.quantization.GPTQ import TransformerEvalWrapper
+
+        precision = torch.bfloat16
+        device = "cpu"
+        checkpoint_path = Path("../gpt-fast/checkpoints/meta-llama/Llama-2-7b-chat-hf/model.pth")
+        model = Transformer.from_name(checkpoint_path.parent.name)
+        checkpoint = torch.load(str(checkpoint_path), mmap=True, weights_only=True)
+        model.load_state_dict(checkpoint, assign=True)
+        model = model.to(dtype=precision, device=device)
+        model.eval()
+        tokenizer_path = checkpoint_path.parent / "tokenizer.model"
+        assert tokenizer_path.is_file(), tokenizer_path
+        tokenizer = SentencePieceProcessor(  # pyre-ignore[28]
+            model_file=str(tokenizer_path)
+        )
+
+        quantizer = Int8DynActInt4WeightQuantizer(groupsize=128, precision=precision)
+        q_model = quantizer.quantize(model)
+        result=TransformerEvalWrapper(
+            q_model,
+            tokenizer,
+            q_model.config.block_size,
+            prepare_inputs_for_model,
+            device,
+        ).run_eval(
+            ["wikitext"],
+            1,
+        )
+        assert result['results']['wikitext']['word_perplexity,none'] < 8.24, (
+            f"accuracy regressed from 8.23 to {result['results']['wikitext']['word_perplexity,none']}"
+        )
 
     @unittest.skip("skipping until we get checkpoints for gpt-fast")
     def test_gptq_quantizer_gpt_fast(self):
@@ -248,5 +297,95 @@ def test_gptq_quantizer_gpt_fast(self):
         with torch.no_grad():
             compiled(inputs[0].values[0], inputs[1].values[0])
 
+    @unittest.skip("skipping until we get checkpoints for gpt-fast")
+    def test_gptq_quantizer_int4wo(self):
+        from torchao.quantization.GPTQ import Int4WeightOnlyGPTQQuantizer, InputRecorder, TransformerEvalWrapper
+        # should be similar to TorchCompileDynamicQuantizer
+        precision = torch.bfloat16
+        device = "cuda"
+        checkpoint_path = Path("../gpt-fast/checkpoints/meta-llama/Llama-2-7b-chat-hf/model.pth")
+        model = Transformer.from_name(checkpoint_path.parent.name)
+        checkpoint = torch.load(str(checkpoint_path), mmap=True, weights_only=True)
+        model.load_state_dict(checkpoint, assign=True)
+        model = model.to(dtype=precision, device="cpu")
+        model.eval()
+        tokenizer_path = checkpoint_path.parent / "tokenizer.model"
+        assert tokenizer_path.is_file(), tokenizer_path
+        tokenizer = SentencePieceProcessor(  # pyre-ignore[28]
+            model_file=str(tokenizer_path)
+        )
+        blocksize = 128
+        percdamp = 0.01
+        groupsize = 128
+        calibration_tasks = ["wikitext"]
+        calibration_limit = 1
+        calibration_seq_length = 100
+        input_prep_func = prepare_inputs_for_model
+        pad_calibration_inputs = False
+
+        inputs = InputRecorder(
+            tokenizer,
+            calibration_seq_length,
+            input_prep_func,
+            pad_calibration_inputs,
+            model.config.vocab_size,
+            device="cpu",
+        ).record_inputs(
+            calibration_tasks,
+            calibration_limit,
+        ).get_inputs()
+
+        quantizer = Int4WeightOnlyGPTQQuantizer(
+            blocksize,
+            percdamp,
+            groupsize,
+        )
+        model.setup_caches(max_batch_size=1, max_seq_length=calibration_seq_length)
+
+        model = quantizer.quantize(model, inputs).cuda()
+        result = TransformerEvalWrapper(
+            model.cuda(),
+            tokenizer,
+            model.config.block_size,
+            prepare_inputs_for_model,
+            device,
+        ).run_eval(
+            ["wikitext"],
+            1,
+        )
+        assert result['results']['wikitext']['word_perplexity,none'] < 7.77, (
+            f"accuracy regressed from 7.76 to {result['results']['wikitext']['word_perplexity,none']}"
+        )
+
+    @unittest.skip("skipping until we get checkpoints for gpt-fast")
+    def test_eval_wrapper(self):
+        from torchao.quantization.GPTQ import TransformerEvalWrapper
+        precision = torch.bfloat16
+        device = "cuda"
+        checkpoint_path = Path("../gpt-fast/checkpoints/meta-llama/Llama-2-7b-chat-hf/model.pth")
+        model = Transformer.from_name(checkpoint_path.parent.name)
+        checkpoint = torch.load(str(checkpoint_path), mmap=True, weights_only=True)
+        model.load_state_dict(checkpoint, assign=True)
+        model = model.to(dtype=precision, device=device)
+        model.eval()
+        tokenizer_path = checkpoint_path.parent / "tokenizer.model"
+        assert tokenizer_path.is_file(), tokenizer_path
+        tokenizer = SentencePieceProcessor(  # pyre-ignore[28]
+            model_file=str(tokenizer_path)
+        )
+        result=TransformerEvalWrapper(
+            model,
+            tokenizer,
+            model.config.block_size,
+            prepare_inputs_for_model,
+            device,
+        ).run_eval(
+            ["wikitext"],
+            1,
+        )
+        assert result['results']['wikitext']['word_perplexity,none']<7.77, (
+            f"accuracy regressed from 7.76 to {result['results']['wikitext']['word_perplexity,none']}"
+        )
+
 if __name__ == "__main__":
     unittest.main()