[CI/Build] Reorganize models tests (#7820)

tests/models/decoder_only/vision_language/test_blip2.py

@@ -0,0 +1,101 @@
+from typing import List, Optional, Tuple
+
+import pytest
+from transformers import AutoModelForVision2Seq, AutoTokenizer
+
+from vllm.multimodal.utils import rescale_image_size
+from vllm.sequence import SampleLogprobs
+
+from ....conftest import IMAGE_ASSETS
+from ...utils import check_logprobs_close
+
+HF_IMAGE_PROMPTS = IMAGE_ASSETS.prompts({
+    "stop_sign":
+    "Question: What's the content of the image? Answer:",
+    "cherry_blossom":
+    "Question: What is the season? Answer:",
+})
+
+
+def vllm_to_hf_output(vllm_output: Tuple[List[int], str,
+                                         Optional[SampleLogprobs]],
+                      model: str):
+    """Sanitize vllm output to be comparable with hf output."""
+    _, output_str, out_logprobs = vllm_output
+
+    hf_output_str = output_str + "\n"
+
+    tokenizer = AutoTokenizer.from_pretrained(model)
+    hf_output_ids = tokenizer.encode(hf_output_str)
+    assert hf_output_ids[0] == tokenizer.bos_token_id
+    hf_output_ids = hf_output_ids[1:]
+
+    return hf_output_ids, hf_output_str, out_logprobs
+
+
+@pytest.mark.parametrize("model", ["Salesforce/blip2-opt-2.7b"])
+@pytest.mark.parametrize(
+    "size_factors",
+    [
+        # No image
+        [],
+        # Single-scale
+        [1.0],
+        # Single-scale, batched
+        [1.0, 1.0, 1.0],
+        # Multi-scale
+        [0.25, 0.5, 1.0],
+    ],
+)
+@pytest.mark.parametrize("dtype", ["half"])
+@pytest.mark.parametrize("max_tokens", [128])
+@pytest.mark.parametrize("num_logprobs", [5])
+def test_models(hf_runner, vllm_runner, image_assets, model, size_factors,
+                dtype: str, max_tokens: int, num_logprobs: int) -> None:
+    """Inference result should be the same between hf and vllm.
+
+    All the image fixtures for the test are from IMAGE_ASSETS.
+    For huggingface runner, we provide the PIL images as input.
+    For vllm runner, we provide MultiModalData objects and corresponding
+    MultiModalConfig as input.
+    Note, the text input is also adjusted to abide by vllm contract.
+    The text output is sanitized to be able to compare with hf.
+    """
+    images = [asset.pil_image for asset in image_assets]
+
+    inputs_per_image = [(
+        [prompt for _ in size_factors],
+        [rescale_image_size(image, factor) for factor in size_factors],
+    ) for image, prompt in zip(images, HF_IMAGE_PROMPTS)]
+
+    # max_model_len should be greater than image_feature_size
+    with vllm_runner(model, dtype=dtype, enforce_eager=True) as vllm_model:
+        vllm_outputs_per_image = [
+            vllm_model.generate_greedy_logprobs(prompts,
+                                                max_tokens,
+                                                num_logprobs=num_logprobs,
+                                                images=images)
+            for prompts, images in inputs_per_image
+        ]
+
+    with hf_runner(model, dtype=dtype,
+                   auto_cls=AutoModelForVision2Seq) as hf_model:
+        hf_outputs_per_image = [
+            hf_model.generate_greedy_logprobs_limit(prompts,
+                                                    max_tokens,
+                                                    num_logprobs=num_logprobs,
+                                                    images=images)
+            for prompts, images in inputs_per_image
+        ]
+
+    for hf_outputs, vllm_outputs in zip(hf_outputs_per_image,
+                                        vllm_outputs_per_image):
+        check_logprobs_close(
+            outputs_0_lst=hf_outputs,
+            outputs_1_lst=[
+                vllm_to_hf_output(vllm_output, model)
+                for vllm_output in vllm_outputs
+            ],
+            name_0="hf",
+            name_1="vllm",
+        )