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Reference.org
Backpropagation through time
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<p>Backpropagation through time (BPTT) is a <a href="/facts/Gradient_method/xwxAR6hM">gradient-based technique</a> for training certain types of <a href="/facts/Recurrent_neural_network/bx7hBVB1">recurrent neural networks</a>, such as <a href="/facts/Recurrent_neural_network/bx7hBVB1">Elman networks</a>. The algorithm was independently derived by numerous researchers. </p>