microsoft

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phi-2

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While model loading is pretty fast (once downloaded) and it takes around 1.5 seconds an inference for 2048 token (max_length) on a A10G / 24GB took ~80 sec.

loading function was

def load_hf_local(model_name, device, dtype:torch.float16):
    """
        load model via Huggingface AutoTokenizer, AutoModelForCausalLM
    """
    start_time = time. time()
    torch.set_default_dtype(dtype)
    tokenizer = transformers.AutoTokenizer.from_pretrained(model_name, local_files_only=True, trust_remote_code=True)
    with torch.device(device):
        model = transformers.AutoModelForCausalLM.from_pretrained(model_name, local_files_only=True, device_map="auto", torch_dtype=dtype, trust_remote_code=True)
        model.to(device)
    print(f"Loaded in {time.time() - start_time: .2f} seconds")
    return tokenizer, model

generate function was

def LLM_generate(model, tokenizer, prompt, length):
    start_time = time.time()
    inputs = tokenizer(prompt, return_tensors="pt", return_attention_mask=False)
    
    model_inputs = inputs.to(device)
    model.to(device)
    
    input_token_len = len(model_inputs.tokens())
    outputs = model.generate(**model_inputs, max_length=length if length >= input_token_len else input_token_len)
    print(f"generated in {time.time() - start_time: .2f} seconds")
    return tokenizer.batch_decode(outputs)[0]

while setting max_length to 512 tokens, led to ~20 seconds.

This is a test ranging from 128 to 2048

generated in  4.37 seconds
max_length:128, elapsed:4.372055530548096
generated in  9.16 seconds
max_length:256, elapsed:9.158923625946045
generated in  19.05 seconds
max_length:512, elapsed:19.05333709716797
generated in  38.90 seconds
max_length:1024, elapsed:38.89565658569336
generated in  79.18 seconds
max_length:2048, elapsed:79.17627263069153