Kronecker product in the Eq.1

Hi, thanks for the work. In Eq.1 in the main paper, there is a Kronecker product between F2d_i and Dpred_i. The shape of F2d_i is (C_F, H, W) and the shape of Dpred_i is (C_D, H, W). However, based on the definition of the Kronecker product (e.g., https://pytorch.org/docs/stable/generated/torch.kron.html), the shape of output F3d_i might be (C_F * C_D, H * H, W * W) instead of (C_F, C_D, H, W). Am I missing something? Note that I understand the motivation and the logic of Eq.1 but I'm just confused about whether it is called Kronecker product. Thanks so much.

Start by reading Eq.1 in the main paper and compare its notation with the linked PyTorch torch.kron definition. Confirm whether the operation and resulting shape are described correctly; done means resolving the terminology or identifying the needed paper clarification.