Custom GRU Implementation

This file contains a custom implementation of a Gated Recurrent Unit (GRU) cell and a GRU layer using PyTorch. The GRU cell is based on the original formulation by Cho et al., 2014, and is designed to process sequences of data, returning hidden states for each time step. The implementation includes both the GRU cell and a layer that utilizes this cell to handle input sequences.