Deep Neural Networks: First step towards thinking like Humans

Different images of digit 3 in different shapes and pixel value arrangements.
https://sites.duke.edu/apep/module-2-the-abcs-of-intoxication/biology-and-chemistry-connections/neuron-structure-and-function/
Perceptron
https://ceklog.kindel.com/2013/02/19/why-nobody-can-copy-apple/
Sigmoid function
This is how a transfer function and activation function works for a single perceptron

But why do we need activation functions at all?

A Multilayer Perceptron or a Deep Neural Network

A deep neural network

Forward Propagation

Backward Propagation

Vectorization
This graph shows the various slopes and the paths the cost function will need to travel in order to minimize itself
Derivative w.r.t weights
Derivative w.r.t biases

Why do we need neural networks at all?

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