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-rw-r--r--doc/nerv_layer.md1
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diff --git a/doc/nerv_layer.md b/doc/nerv_layer.md
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@@ -25,6 +25,7 @@ Abstract method.
Given `input` and the current parameters, propagate and store the result in `output`.
* __void Layer.back_propagate(Layer self, Matrix next_bp_err, Matrix bp_err, Matrix input, Matrix output)__
Abstract method.
+Calculate the error on the inputs and store them in `next_bp_err`.
* __void Layer.check_dim_len(int len_in, int len_out)__
Check whether `#self.dim_in == len_in` and `#self.dim_out == len_out`, if violated, an error will be posted.