RuntimeError: mat1 and mat2 shapes cannot be multiplied (7168x7 and 25088x200)

这个错误通常表示矩阵乘法操作的维度不匹配。根据错误信息，mat1是一个7168x7的矩阵，而mat2是一个25088x200的矩阵，它们的维度无法相乘。这是在使用VGG19提取图像特征时出现的问题。具体地说，卷积层的输入为四维，而全连接层接受维度为2的输入，通常为。解决方案之一是在全连接层前加入维度变化，使用torch.flatten()函数将输出的维度从（512*7*7）变为合适的维度，如（batch_size, size）。另外一种解决方案是使用x.view(-1, 7*7*1024)来改变输入的维度。这样就可以解决矩阵乘法维度不匹配的问题。<span class="em">1</span><span class="em">2</span>
#### 引用[.reference_title]
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