Bidirectional ConvLSTM module. Before the application of this module, the batch and sequence dimensions are split, and the input is duplicated but inverted in the sequence dimension. A ConvLSTM module is applied over both tensors, and the result of the application over the inverted one is re-inverted and concatenated with the result in the forward direction. The output of the module is obtained with a convolution over the concatenated tensors, which gives an output with the same dimension as the input.