init

examples/multilora_inference.py

@@ -0,0 +1,124 @@
+"""
+This example shows how to use the multi-LoRA functionality
+for offline inference.
+
+Requires HuggingFace credentials for access to Llama2.
+"""
+
+from typing import List, Optional, Tuple
+
+from huggingface_hub import snapshot_download
+
+from vllm import EngineArgs, LLMEngine, RequestOutput, SamplingParams
+from vllm.lora.request import LoRARequest
+
+
+def create_test_prompts(
+        lora_path: str
+) -> List[Tuple[str, SamplingParams, Optional[LoRARequest]]]:
+    """Create a list of test prompts with their sampling parameters.
+
+    2 requests for base model, 4 requests for the LoRA. We define 2
+    different LoRA adapters (using the same model for demo purposes).
+    Since we also set `max_loras=1`, the expectation is that the requests
+    with the second LoRA adapter will be ran after all requests with the
+    first adapter have finished.
+    """
+    return [
+        ("A robot may not injure a human being",
+         SamplingParams(temperature=0.0,
+                        logprobs=1,
+                        prompt_logprobs=1,
+                        max_tokens=128), None),
+        ("To be or not to be,",
+         SamplingParams(temperature=0.8,
+                        top_k=5,
+                        presence_penalty=0.2,
+                        max_tokens=128), None),
+        (
+            "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_74 (icao VARCHAR, airport VARCHAR)\n\n question: Name the ICAO for lilongwe international airport [/user] [assistant]",  # noqa: E501
+            SamplingParams(temperature=0.0,
+                           logprobs=1,
+                           prompt_logprobs=1,
+                           max_tokens=128,
+                           stop_token_ids=[32003]),
+            LoRARequest("sql-lora", 1, lora_path)),
+        (
+            "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_11 (nationality VARCHAR, elector VARCHAR)\n\n question: When Anchero Pantaleone was the elector what is under nationality? [/user] [assistant]",  # noqa: E501
+            SamplingParams(n=3,
+                           best_of=3,
+                           use_beam_search=True,
+                           temperature=0,
+                           max_tokens=128,
+                           stop_token_ids=[32003]),
+            LoRARequest("sql-lora", 1, lora_path)),
+        (
+            "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_74 (icao VARCHAR, airport VARCHAR)\n\n question: Name the ICAO for lilongwe international airport [/user] [assistant]",  # noqa: E501
+            SamplingParams(temperature=0.0,
+                           logprobs=1,
+                           prompt_logprobs=1,
+                           max_tokens=128,
+                           stop_token_ids=[32003]),
+            LoRARequest("sql-lora2", 2, lora_path)),
+        (
+            "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_11 (nationality VARCHAR, elector VARCHAR)\n\n question: When Anchero Pantaleone was the elector what is under nationality? [/user] [assistant]",  # noqa: E501
+            SamplingParams(n=3,
+                           best_of=3,
+                           use_beam_search=True,
+                           temperature=0,
+                           max_tokens=128,
+                           stop_token_ids=[32003]),
+            LoRARequest("sql-lora", 1, lora_path)),
+    ]
+
+
+def process_requests(engine: LLMEngine,
+                     test_prompts: List[Tuple[str, SamplingParams,
+                                              Optional[LoRARequest]]]):
+    """Continuously process a list of prompts and handle the outputs."""
+    request_id = 0
+
+    while test_prompts or engine.has_unfinished_requests():
+        if test_prompts:
+            prompt, sampling_params, lora_request = test_prompts.pop(0)
+            engine.add_request(str(request_id),
+                               prompt,
+                               sampling_params,
+                               lora_request=lora_request)
+            request_id += 1
+
+        request_outputs: List[RequestOutput] = engine.step()
+
+        for request_output in request_outputs:
+            if request_output.finished:
+                print(request_output)
+
+
+def initialize_engine() -> LLMEngine:
+    """Initialize the LLMEngine."""
+    # max_loras: controls the number of LoRAs that can be used in the same
+    #   batch. Larger numbers will cause higher memory usage, as each LoRA
+    #   slot requires its own preallocated tensor.
+    # max_lora_rank: controls the maximum supported rank of all LoRAs. Larger
+    #   numbers will cause higher memory usage. If you know that all LoRAs will
+    #   use the same rank, it is recommended to set this as low as possible.
+    # max_cpu_loras: controls the size of the CPU LoRA cache.
+    engine_args = EngineArgs(model="meta-llama/Llama-2-7b-hf",
+                             enable_lora=True,
+                             max_loras=1,
+                             max_lora_rank=8,
+                             max_cpu_loras=2,
+                             max_num_seqs=256)
+    return LLMEngine.from_engine_args(engine_args)
+
+
+def main():
+    """Main function that sets up and runs the prompt processing."""
+    engine = initialize_engine()
+    lora_path = snapshot_download(repo_id="yard1/llama-2-7b-sql-lora-test")
+    test_prompts = create_test_prompts(lora_path)
+    process_requests(engine, test_prompts)
+
+
+if __name__ == '__main__':
+    main()