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Understanding and Coding a neural network for XOR logic classifier from scratch by Shayan Ali Bhatti Analytics Vidhya

bluetearcapital > Forex Trading > Understanding and Coding a neural network for XOR logic classifier from scratch by Shayan Ali Bhatti Analytics Vidhya

An XOR function should return a true value if the two inputs are not equal and a false value if they are equal. All possible inputs and predicted outputs are shown in figure 1. This completes a single forward pass, where our predicted_output needs to be compared with the expected_output. Based on this comparison, the weights for both the hidden layers and the output layers are changed using backpropagation. Backpropagation is done using the Gradient Descent algorithm.

Why can’t perceptrons solve the XOR problem?

The training set and the test set are exactlythe same in this problem. So the interesting question is only if the model isable to find a decision boundary which classifies all four points correctly. RNNs suffer from the vanishing gradient problem which occurs when the gradient becomes too small to update weights and biases during backpropagation. This makes it difficult for them to learn long-term dependencies in data. However, it’s important to note that CNNs are designed for tasks like image recognition where there is spatial correlation between pixels.

1.3. But “Hidden Layers” Aren’t Hidden¶

I decided to check online resources, but as of the time of writing this, there was really no explanation on how to go about it. So after personal readings, I finally understood how to go about it, which is the reason for this medium post. A good resource is the Tensorflow Neural Net playground, https://traderoom.info/ where you can try out different network architectures and view the results. Let’s train our MLP with a learning rate of 0.2 over 5000 epochs. Let’s bring everything together by creating an MLP class. The plot function is exactly the same as the one in the Perceptron class.

Note #1: Adding more layers or nodes

Visually what’s happening is the matrix multiplications are moving everybody sorta the same way (you can find more about it here). Both forward and back propagation are re-run thousands of times on each input combination until the network can accurately predict the expected output of the possible inputs using forward propagation. It is worth noting that an MLP can have any number of units in its input, hidden and output layers.

AND, NAND and XOR gate

So  In this article let us see what is the XOR logic and how to integrate the XOR logic using neural networks. Unlike AND and OR, XOR’s outputs are not linearly separable.Therefore, we need to introduce another hidden layer to solve it. For the system to generalize over input space and to make it capable of predicting accurately for new use cases, we require to train the model with available inputs. During training, we predict the output of model for different inputs and compare the predicted output with actual output in our training set. The difference in actual and predicted output is termed as loss over that input. The summation of losses across all inputs is termed as cost function.

The central object of TensorFlow is a dataflow graph representing calculations. The vertices of the graph represent operations, and the edges represent tensors (multidimensional arrays that are the basis of TensorFlow). The data flow graph as a whole is a complete description of the calculations that are implemented within the session and performed on CPU or GPU devices.

  1. As we talked about, each of the neurons has an input, $i_n$, a connection to the next neuron layer, called a synapse, which carries a weight $w_n$, and an output layer.
  2. Remember the linear activation function we used on the output node of our perceptron model?
  3. Though the output generation process is a direct extension of that of the perceptron, updating weights isn’t so straightforward.

This incapability of perceptron to not been able to handle X-OR along with some other factors led to an AI winter in which less work was done in neural networks. xor neural network Later many approaches appeared which are extension of basic perceptron and are capable of solving X-OR. M maps the internal representation to the output scalar.

After printing our result we can see that we get a value that is close to zero and the original value is also zero. On the other hand, when we test the fifth number in the dataset we get the value that is close to 1 and the original value is also 1. We will just change the y array to be equal to (0,1,1,0).

The further $x$ goes in the negative direction, the closer it gets to 0. However, it doesn’t ever touch 0 or 1, which is important to remember. The basic idea is to take the input, multiply it by the synaptic weight, and check if the output is correct. If it is not, adjust the weight, multiply it by the input again, check the output and repeat, until we have reached an ideal synaptic weight.

This is because they lack the ability to capture non-linear relationships between input variables. For the XOR problem, we can use a network with two input neurons, two hidden neurons, and one output neuron. Now that we have defined everything we need, we’ll create a training function. As an input, we will pass model, criterion, optimizer, X, y and a number of iterations. Then, we will create a list where we will store the loss for each epoch.

We also need to use multiple layers of neurons to learn complex patterns in data. Deep networks have multiple layers and in recent works have shown capability to efficiently solve problems like object identification, speech recognition, language translation and many more. The XOR problem serves as a fundamental example of the limitations of single-layer perceptrons and the need for more complex neural networks. By introducing multi-layer perceptrons, the backpropagation algorithm, and appropriate activation functions, we can successfully solve the XOR problem. Neural networks have the potential to solve a wide range of complex problems, and understanding the XOR problem is a crucial step towards harnessing their full power. The XOR problem is significant because it highlights the limitations of single-layer perceptrons.

Also in the output h3 we will just change torch.tensor to hstack in order to stack our data horizontally. Again, we just change the y data, and all the other steps will be the same as for the last two models. We will define prediction y_hat and we will calculate the loss which will be equal to criterion of the y_hat and the original y. Then we will store loss inside this all_loss list that we have created. Now we can call the function create_dataset() and plot our data.

To overcome this limitation, we need to use multi-layer feedforward networks. For example, if we have two inputs X and Y that are directly proportional (i.e., as X increases, Y also increases), a traditional neural network can learn this relationship easily. However, when there is a non-linear relationship between input variables like in the case of the XOR problem, traditional neural networks fail to capture this relationship. We’ll give our inputs, which is either 0 or 1, and they both will be multiplied by the synaptic weight.

As we can see from the truth table, the XOR gate produces a true output only when the inputs are different. This non-linear relationship between the inputs and the output poses a challenge for single-layer perceptrons, which can only learn linearly separable patterns. It turns out that TensorFlow is quite simple to install and matrix calculations can be easily described on it.

This parametric learning is done using gradient descent where the gradients are calculated using the back-propagation algorithm. In the above figure, we can see that above the linear separable line the red triangle is overlapping with the pink dot and linear separability of data points is not possible using the XOR logic. So now let us understand how to solve the XOR problem with neural networks. The information of a neural network is stored in the interconnections between the neurons i.e. the weights.

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