Fig. 4From: Biomedical semantic indexing by deep neural network with multi-task learningThe Structure of BRNN. The pink circles annotated with x denotes the input vectors, the blue circles annotated with Hl and Hr denote the output of the recurrent hidden units in two different directions, and the green circles annotated with H denotes the output of the BRNN, which is the hidden state vector generated by concatenating the recurrent hidden states from two directionsBack to article page