PyTorch Tensor Concatenation: Combining 'm' and 'd' along Dimension 0

This code defines two PyTorch tensors, 'm' and 'd', with shapes '(253, 512)' and '(861, 512)' respectively. The 'torch.randn' function generates random numbers from a normal distribution with mean 0 and standard deviation 1.

The code then concatenates the two tensors along the first dimension using the 'torch.cat' function, resulting in a new tensor 'm_d' with shape '(1114, 512)'.