Feb-25-2019, 03:30 AM
import numpy as np #Input array X=np.array([[1,0,1,0],[1,0,1,1],[0,1,0,1]]) #Output y=np.array([[1],[1],[0]]) #Sigmoid Function def sigmoid (x): return 1/(1 + np.exp(-x)) #Derivative of Sigmoid Function def derivatives_sigmoid(x): return x * (1 - x) #Variable initialization epoch=5000 #Setting training iterations lr=0.1 #Setting learning rate inputlayer_neurons = X.shape[1] #number of features in data set hiddenlayer_neurons = 3 #number of hidden layers neurons output_neurons = 1 #number of neurons at output layer #weight and bias initialization wh=np.random.uniform(size=(inputlayer_neurons,hiddenlayer_neurons)) bh=np.random.uniform(size=(1,hiddenlayer_neurons)) wout=np.random.uniform(size=(hiddenlayer_neurons,output_neurons)) bout=np.random.uniform(size=(1,output_neurons)) for i in range(epoch): #Forward Propogation hidden_layer_input1=np.dot(X,wh) hidden_layer_input=hidden_layer_input1 + bh hiddenlayer_activations = sigmoid(hidden_layer_input) output_layer_input1=np.dot(hiddenlayer_activations,wout) output_layer_input= output_layer_input1+ bout output = sigmoid(output_layer_input) #Backpropagation E = y-output slope_output_layer = derivatives_sigmoid(output) slope_hidden_layer = derivatives_sigmoid(hiddenlayer_activations) d_output = E * slope_output_layer Error_at_hidden_layer = d_output.dot(wout.T) d_hiddenlayer = Error_at_hidden_layer * slope_hidden_layer wout += hiddenlayer_activations.T.dot(d_output) *lr bout += np.sum(d_output, axis=0,keepdims=True) *lr wh += X.T.dot(d_hiddenlayer) *lr bh += np.sum(d_hiddenlayer, axis=0,keepdims=True) *lr print outputWhen I run the code above using my Python 3.5.2 interpreter, I get the following error.
File "nn_in_python.py", line 11
return 1/(1 + np.exp(-x))
^
IndentationError: expected an indented block
It says something about line 11 should be indented. But it is indented! So what is wrong and how to fix.
I am very new to python, but not to programming.
I just need to know what is wrong here. this code was taken directly from a tutorial, and it should run fine.
Any help appreciated.Thanks in advance.
respectfully,
ErnestTBass