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/*! \fn Eigen::MatrixXf layer::set_weights_convolutional(Eigen::MatrixXf filter_vector, bool is_backprop_weights) \brief Create a matrix of the filters. \param depth indicates which filter from the filter bank is used for convolution \param is_backprop_weights tells if the function should create the filter matrix for computing forwardpass and backpropagation of the inputs (bool is_backprop_weights = false) or the bakcpropagation of the weights (bool is_backprop_weights = true) */ Eigen::MatrixXf layer::set_weights_convolutional(Eigen::MatrixXf filter_input_vector, bool is_backprop_weights) { int output_rows = (input_rows + 2 * padding_size + stride - filter_rows) / stride; int output_cols = (input_cols + 2 * padding_size + stride - filter_cols) / stride; Eigen::MatrixXf filter_vector; filter_vector.resize(input_rows, input_cols + 2 * padding_size); for(int i = 0; i < weights.rows(); i++) for(int j = 0; j < weights.cols(); j++) { filter_vector(i, j) = filter_input_vector(i, j); } filter_vector.resize(input_rows*(input_cols + 2 * padding_size),1); Eigen::MatrixXf filter_matrix; filter_matrix.resize(output_rows*output_cols, input_rows*input_cols); int start = int((input_cols + 2 * padding_size) * padding_size + padding_size); int start_index = start; int stop_after = int(input_cols) - 1; for(int i = 0; i < output_rows * output_cols - 1; i++) { if(start_index < 0) start_index += input_rows * input_cols; for(int j = 0; j < input_rows; j++) { int current_index = start_index + int(j*(input_cols + 2 * padding_size)) ; for(int x = int(j * input_cols); x < i + stop_after; i++) { if(is_backprop_weights) filter_matrix(i,x)=1; else filter_matrix(i,x)=filter_vector(current_index++); } } start_index -= 1; if(i % output_rows == 0) start_index = start - int((input_cols+2*padding_size)*i/ output_rows); } // now do the big matrix return filter_matrix; }
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