下面是pytorch中的矩阵乘，三种方式结果相同

tensor = torch.ones(4, 4)

y1 = tensor @ tensor.T
y2 = tensor.matmul(tensor.T)

y3 = torch.rand_like(tensor)
torch.matmul(tensor, tensor.T, out=y3)

下面是pytorch中的点乘，三种方式结果相同

tensor = torch.ones(4, 4)

z1 = tensor * tensor
z2 = tensor.mul(tensor)

z3 = torch.rand_like(tensor)
torch.mul(tensor, tensor, out=z3)