will torch.matmul regards as zero_ops ?

[DavideHe]

when I get the macs with thop ,I find the op's macs of torch.matmul will is 0, but it is very heavy macs in self attention of transformer

class M(nn.Module):
    def __init__(self):
        super().__init__()
      
    def forward(self,x):
        out = torch.matmul(x,x.transpose(-1, -2))
        print(out.shape)
        return out