I would reproduce an online tutorial or Kaggle competition first, and then substitute the given model with yours or similar (adapted to the specific task). This way it would be easier to pinpoint whether the problem comes from your model architecture or your data or preprocessing (often the case and my guess based on your description).
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我将首先复制在线教程或Kaggle竞争，然后用您的或类似的模型替换给定模型（适合特定任务）。这样，可以更容易地确定问题是来自您的模型架构还是数据或预处理（通常是根据您的描述，我的猜测）。
I would reproduce an online tutorial or Kaggle competition first, and then substitute the given model with yours or similar (adapted to the specific task). This way it would be easier to pinpoint whether the problem comes from your model architecture or your data or preprocessing (often the case and my guess based on your description).