Cursera: machine learning ex4.

machine_learning/mlclass-ex4-008/mlclass-ex4/debugInitializeWeights.m

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+function W = debugInitializeWeights(fan_out, fan_in)
+%DEBUGINITIALIZEWEIGHTS Initialize the weights of a layer with fan_in
+%incoming connections and fan_out outgoing connections using a fixed
+%strategy, this will help you later in debugging
+%   W = DEBUGINITIALIZEWEIGHTS(fan_in, fan_out) initializes the weights 
+%   of a layer with fan_in incoming connections and fan_out outgoing 
+%   connections using a fix set of values
+%
+%   Note that W should be set to a matrix of size(1 + fan_in, fan_out) as
+%   the first row of W handles the "bias" terms
+%
+
+% Set W to zeros
+W = zeros(fan_out, 1 + fan_in);
+
+% Initialize W using "sin", this ensures that W is always of the same
+% values and will be useful for debugging
+W = reshape(sin(1:numel(W)), size(W)) / 10;
+
+% =========================================================================
+
+end