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The inaccurate flop results after several rounds

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难度
4/5
预计耗时
3-5 天
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
python
领域
machine-learning, performance

调研方向

从 profiler.get_model_profile 调用开始，使用提供的 test_model 循环和固定的输入形状重现重复测量。将后续轮次的 FLOPs、MACs、参数量和延迟与第一轮进行比较；完成标准是，对相同模型和输入重复进行 profiling 不会导致 FLOPs 增加。

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描述

Hi I tried to use the method "get_model_profile" to get the latency and flop for my model. To get avoid of the influence from randomness, I used this method in a for loop for several times, and then an average operation would be done.
However, I found the results for the following rounds of the first one are not correct, which is far away from the theoritical result. As shown in the fig below, you could see the flops is increasing with the round, which is not correct, since I gave the same size of input into the model.
image
And this is the code:

def test_model(model, input_shape, warmup=20, num_tests=1000):
    results = []
    
    for _ in range(num_tests):
        #from profiler import get_model_profile
        flops, macs, params, latency = profiler.get_model_profile(
            model=model,
            input_shape=input_shape,
            print_profile=False,
            detailed=True,
            module_depth=-1,
            top_modules=1,
            warm_up=warmup,
            as_string=False
        )
        del sys.modules['profiler']
        results.append((flops/10**9, macs/10**9, params/10**3, latency*10**3))

    df = pd.DataFrame(results, columns=['FLOPs', 'MACs', 'Params', 'Latency'])
    return df

df_swin = test_model(Swin, (batch_size, math.prod(input_resolution), dim), warmup=warmup, num_tests=num_tests)

I tried to modify this code, and found if I could assign the model again in a different iteration with the profiler imported again, then the result is correct, shown in the fig below.
image

And the following is the modified code.

def test_model(input_shape, warmup=20, num_tests=1000):
    results = []
    for _ in range(num_tests):
        #from profiler import get_model_profile
        import profiler
        model = MySwinTransformerModel(dim, input_resolution, num_heads, window_size, mlp_ratio, depth).to(device) 
        # model = MyTensorizedTransformerModel(dim, input_resolution, num_heads, n_proj, mlp_ratio, depth).to(device) 
        flops, macs, params, latency = profiler.get_model_profile(
            model=model,
            input_shape=input_shape,
            print_profile=False,
            detailed=True,
            module_depth=-1,
            top_modules=1,
            warm_up=warmup,
            as_string=False
        )
        del sys.modules['profiler']
        results.append((flops/10**9, macs/10**9, params/10**3, latency*10**3))

    df = pd.DataFrame(results, columns=['FLOPs', 'MACs', 'Params', 'Latency'])
    return df
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