[Model][Misc] Add e5-mistral-7b-instruct and Embedding API (#3734)

examples/offline_inference_embedding.py

@@ -0,0 +1,17 @@
+from vllm import LLM
+
+# Sample prompts.
+prompts = [
+    "Hello, my name is",
+    "The president of the United States is",
+    "The capital of France is",
+    "The future of AI is",
+]
+
+# Create an LLM.
+model = LLM(model="intfloat/e5-mistral-7b-instruct", enforce_eager=True)
+# Generate embedding. The output is a list of EmbeddingRequestOutputs.
+outputs = model.encode(prompts)
+# Print the outputs.
+for output in outputs:
+    print(output.outputs.embedding)  # list of 4096 floats

examples/openai_embedding_client.py

@@ -0,0 +1,23 @@
+from openai import OpenAI
+
+# Modify OpenAI's API key and API base to use vLLM's API server.
+openai_api_key = "EMPTY"
+openai_api_base = "http://localhost:8000/v1"
+
+client = OpenAI(
+    # defaults to os.environ.get("OPENAI_API_KEY")
+    api_key=openai_api_key,
+    base_url=openai_api_base,
+)
+
+models = client.models.list()
+model = models.data[0].id
+
+responses = client.embeddings.create(input=[
+    "Hello my name is",
+    "The best thing about vLLM is that it supports many different models"
+],
+                                     model=model)
+
+for data in responses.data:
+    print(data.embedding)  # list of float of len 4096

requirements-dev.txt

@@ -19,12 +19,15 @@ pytest-forked
 pytest-asyncio
 pytest-rerunfailures
 pytest-shard
-httpx
+
+# testing utils
+awscli
 einops # required for MPT
+httpx
+peft
 requests
 ray
-peft
-awscli
+sentence-transformers # required for embedding
 
 # Benchmarking
 aiohttp

tests/conftest.py

@@ -133,6 +133,10 @@ def example_long_prompts() -> List[str]:
     "llava-hf/llava-1.5-7b-hf": LlavaForConditionalGeneration,
 }
 
+_EMBEDDING_MODELS = [
+    "intfloat/e5-mistral-7b-instruct",
+]
+
 
 class HfRunner:
 
@@ -145,14 +149,7 @@ def __init__(
         assert dtype in _STR_DTYPE_TO_TORCH_DTYPE
         torch_dtype = _STR_DTYPE_TO_TORCH_DTYPE[dtype]
         self.model_name = model_name
-        if model_name not in _VISION_LANGUAGE_MODELS:
-            self.model = AutoModelForCausalLM.from_pretrained(
-                model_name,
-                torch_dtype=torch_dtype,
-                trust_remote_code=True,
-            ).cuda()
-            self.processor = None
-        else:
+        if model_name in _VISION_LANGUAGE_MODELS:
             self.model = _VISION_LANGUAGE_MODELS[model_name].from_pretrained(
                 model_name,
                 torch_dtype=torch_dtype,
@@ -162,6 +159,20 @@ def __init__(
                 model_name,
                 torch_dtype=torch_dtype,
             )
+        elif model_name in _EMBEDDING_MODELS:
+            # Lazy init required for AMD CI
+            from sentence_transformers import SentenceTransformer
+            self.model = SentenceTransformer(
+                model_name,
+                device="cpu",
+            ).to(dtype=torch_dtype).cuda()
+        else:
+            self.model = AutoModelForCausalLM.from_pretrained(
+                model_name,
+                torch_dtype=torch_dtype,
+                trust_remote_code=True,
+            ).cuda()
+            self.processor = None
         if tokenizer_name is None:
             tokenizer_name = model_name
         self.tokenizer = get_tokenizer(tokenizer_name, trust_remote_code=True)
@@ -334,6 +345,9 @@ def generate_greedy_logprobs_limit(
         return [(output_ids, output_str, output_logprobs)
                 for output_ids, output_str, output_logprobs in outputs]
 
+    def encode(self, prompts: List[str]) -> List[List[torch.Tensor]]:
+        return self.model.encode(prompts)
+
     def __del__(self):
         del self.model
         cleanup()
@@ -459,6 +473,14 @@ def generate_beam_search(
         outputs = self.generate(prompts, beam_search_params)
         return outputs
 
+    def encode(self, prompts: List[str]) -> List[List[float]]:
+        req_outputs = self.model.encode(prompts)
+        outputs = []
+        for req_output in req_outputs:
+            embedding = req_output.outputs.embedding
+            outputs.append(embedding)
+        return outputs
+
     def __del__(self):
         del self.model
         cleanup()

tests/engine/output_processor/test_multi_step.py

@@ -9,8 +9,8 @@
 from vllm.engine.output_processor.multi_step import MultiStepOutputProcessor
 from vllm.engine.output_processor.stop_checker import StopChecker
 from vllm.sampling_params import SamplingParams
-from vllm.sequence import (Logprob, SequenceGroupOutput, SequenceOutput,
-                           SequenceStatus)
+from vllm.sequence import (CompletionSequenceGroupOutput, Logprob,
+                           SequenceOutput, SequenceStatus)
 from vllm.transformers_utils.detokenizer import Detokenizer
 from vllm.utils import Counter
 
@@ -51,7 +51,7 @@ def test_appends_token_ids(num_new_tokens: int, seq_output_len: int):
     new_token_ids = list(range(num_new_tokens))
 
     outputs = [
-        SequenceGroupOutput(
+        CompletionSequenceGroupOutput(
             samples=[
                 SequenceOutput(
                     parent_seq_id=seq.seq_id,
@@ -103,7 +103,7 @@ def test_respects_max_tokens(num_new_tokens: int, seq_prompt_len: int,
     new_token_ids = list(range(num_new_tokens))
 
     outputs = [
-        SequenceGroupOutput(
+        CompletionSequenceGroupOutput(
             samples=[
                 SequenceOutput(
                     parent_seq_id=seq.seq_id,
@@ -170,7 +170,7 @@ def test_respects_eos_token_id(num_new_tokens: int, seq_prompt_len: int,
     new_token_ids[eos_index] = eos_token_id
 
     outputs = [
-        SequenceGroupOutput(
+        CompletionSequenceGroupOutput(
             samples=[
                 SequenceOutput(
                     parent_seq_id=seq.seq_id,
@@ -239,7 +239,7 @@ def test_ignores_eos_token_id(num_new_tokens: int, seq_prompt_len: int,
     new_token_ids[eos_index] = eos_token_id
 
     outputs = [
-        SequenceGroupOutput(
+        CompletionSequenceGroupOutput(
             samples=[
                 SequenceOutput(
                     parent_seq_id=seq.seq_id,

tests/entrypoints/openai/test_serving_chat.py

@@ -14,6 +14,7 @@ class MockModelConfig:
     tokenizer_mode = "auto"
     max_model_len = 100
     tokenizer_revision = None
+    embedding_mode = False
 
 
 @dataclass

tests/entrypoints/test_openai_server.py

@@ -23,6 +23,7 @@
 MAX_SERVER_START_WAIT_S = 600  # wait for server to start for 60 seconds
 # any model with a chat template should work here
 MODEL_NAME = "HuggingFaceH4/zephyr-7b-beta"
+EMBEDDING_MODEL_NAME = "intfloat/e5-mistral-7b-instruct"
 # technically this needs Mistral-7B-v0.1 as base, but we're not testing
 # generation quality here
 LORA_NAME = "typeof/zephyr-7b-beta-lora"
@@ -121,7 +122,7 @@ def zephyr_lora_files():
     return snapshot_download(repo_id=LORA_NAME)
 
 
-@pytest.fixture(scope="session")
+@pytest.fixture(scope="module")
 def server(zephyr_lora_files):
     ray.init()
     server_runner = ServerRunner.remote([
@@ -150,6 +151,25 @@ def server(zephyr_lora_files):
     ray.shutdown()
 
 
+@pytest.fixture(scope="module")
+def embedding_server(zephyr_lora_files):
+    ray.shutdown()
+    ray.init()
+    server_runner = ServerRunner.remote([
+        "--model",
+        EMBEDDING_MODEL_NAME,
+        # use half precision for speed and memory savings in CI environment
+        "--dtype",
+        "bfloat16",
+        "--max-model-len",
+        "8192",
+        "--enforce-eager",
+    ])
+    ray.get(server_runner.ready.remote())
+    yield server_runner
+    ray.shutdown()
+
+
 @pytest.fixture(scope="module")
 def client():
     client = openai.AsyncOpenAI(
@@ -890,5 +910,79 @@ async def test_long_seed(server, client: openai.AsyncOpenAI):
                 or "less_than_equal" in exc_info.value.message)
 
 
+@pytest.mark.parametrize(
+    "model_name",
+    [EMBEDDING_MODEL_NAME],
+)
+async def test_single_embedding(embedding_server, client: openai.AsyncOpenAI,
+                                model_name: str):
+    input = [
+        "The chef prepared a delicious meal.",
+    ]
+
+    # test single embedding
+    embeddings = await client.embeddings.create(
+        model=model_name,
+        input=input,
+        encoding_format="float",
+    )
+    assert embeddings.id is not None
+    assert embeddings.data is not None and len(embeddings.data) == 1
+    assert len(embeddings.data[0].embedding) == 4096
+    assert embeddings.usage.completion_tokens == 0
+    assert embeddings.usage.prompt_tokens == 9
+    assert embeddings.usage.total_tokens == 9
+
+    # test using token IDs
+    input = [1, 1, 1, 1, 1]
+    embeddings = await client.embeddings.create(
+        model=model_name,
+        input=input,
+        encoding_format="float",
+    )
+    assert embeddings.id is not None
+    assert embeddings.data is not None and len(embeddings.data) == 1
+    assert len(embeddings.data[0].embedding) == 4096
+    assert embeddings.usage.completion_tokens == 0
+    assert embeddings.usage.prompt_tokens == 5
+    assert embeddings.usage.total_tokens == 5
+
+
+@pytest.mark.parametrize(
+    "model_name",
+    [EMBEDDING_MODEL_NAME],
+)
+async def test_batch_embedding(embedding_server, client: openai.AsyncOpenAI,
+                               model_name: str):
+    # test List[str]
+    inputs = [
+        "The cat sat on the mat.", "A feline was resting on a rug.",
+        "Stars twinkle brightly in the night sky."
+    ]
+    embeddings = await client.embeddings.create(
+        model=model_name,
+        input=inputs,
+        encoding_format="float",
+    )
+    assert embeddings.id is not None
+    assert embeddings.data is not None and len(embeddings.data) == 3
+    assert len(embeddings.data[0].embedding) == 4096
+
+    # test List[List[int]]
+    inputs = [[4, 5, 7, 9, 20], [15, 29, 499], [24, 24, 24, 24, 24],
+              [25, 32, 64, 77]]
+    embeddings = await client.embeddings.create(
+        model=model_name,
+        input=inputs,
+        encoding_format="float",
+    )
+    assert embeddings.id is not None
+    assert embeddings.data is not None and len(embeddings.data) == 4
+    assert len(embeddings.data[0].embedding) == 4096
+    assert embeddings.usage.completion_tokens == 0
+    assert embeddings.usage.prompt_tokens == 17
+    assert embeddings.usage.total_tokens == 17
+
+
 if __name__ == "__main__":
     pytest.main([__file__])

tests/models/test_embedding.py

@@ -0,0 +1,44 @@
+"""Compare the outputs of HF and vLLM for Mistral models using greedy sampling.
+
+Run `pytest tests/models/test_llama_embedding.py`.
+"""
+import pytest
+import torch
+import torch.nn.functional as F
+
+MODELS = [
+    "intfloat/e5-mistral-7b-instruct",
+]
+
+
+def compare_embeddings(embeddings1, embeddings2):
+    similarities = [
+        F.cosine_similarity(torch.tensor(e1), torch.tensor(e2), dim=0)
+        for e1, e2 in zip(embeddings1, embeddings2)
+    ]
+    return similarities
+
+
+@pytest.mark.parametrize("model", MODELS)
+@pytest.mark.parametrize("dtype", ["half"])
+def test_models(
+    hf_runner,
+    vllm_runner,
+    example_prompts,
+    model: str,
+    dtype: str,
+) -> None:
+    hf_model = hf_runner(model, dtype=dtype)
+    hf_outputs = hf_model.encode(example_prompts)
+    del hf_model
+
+    vllm_model = vllm_runner(model, dtype=dtype)
+    vllm_outputs = vllm_model.encode(example_prompts)
+    del vllm_model
+
+    similarities = compare_embeddings(hf_outputs, vllm_outputs)
+    all_similarities = torch.stack(similarities)
+    tolerance = 1e-2
+    assert torch.all((all_similarities <= 1.0 + tolerance)
+                     & (all_similarities >= 1.0 - tolerance)
+                     ), f"Not all values are within {tolerance} of 1.0"

tests/samplers/test_logits_processor.py

@@ -36,14 +36,14 @@ def pick_vllm(token_ids, logits):
     # test logits_processors when prompt_logprobs is not None
     vllm_model.model._add_request(
         prompt=example_prompts[0],
-        sampling_params=params_with_logprobs,
+        params=params_with_logprobs,
         prompt_token_ids=None,
     )
 
     # test prompt_logprobs is not None
     vllm_model.model._add_request(
         prompt=example_prompts[1],
-        sampling_params=SamplingParams(
+        params=SamplingParams(
             prompt_logprobs=3,
             max_tokens=max_tokens,
         ),
@@ -53,7 +53,7 @@ def pick_vllm(token_ids, logits):
     # test grouped requests
     vllm_model.model._add_request(
         prompt=example_prompts[2],
-        sampling_params=SamplingParams(max_tokens=max_tokens),
+        params=SamplingParams(max_tokens=max_tokens),
         prompt_token_ids=None,
     )
 

tests/samplers/test_seeded_generate.py

@@ -60,7 +60,7 @@ def test_random_sample_with_seed(
             llm._add_request(
                 prompt=prompt,
                 prompt_token_ids=None,
-                sampling_params=params,
+                params=params,
             )
 
     results = llm._run_engine(use_tqdm=False)