Fig. 3From: BO-LSTM: classifying relations via long short-term memory networks along biomedical ontologiesBO-LSTM unit, using a sequence of ChEBI ontology concepts as an example. Circle refers to sigmoid function and rectangle to tanh, while “x” and “+” refer to element-wise multiplication and addition. h: hidden unit; \(\tilde {m}\): candidate memory cell; m: memory cell; i input gate; f forget gate; o: output gateBack to article page