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Build a Neural Net in 4 Minutes

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Siraj Raval

How does a Neural network work? Its the basis of deep learning and the reason why image recognition, chatbots, self driving cars, and language translation work! In this video, i’ll use python to code up a neural network in just 4 minutes using just the numpy library, capable of doing matrix mathematics.

Code for this video:
https://github.com/llSourcell/Make_a_neural_network

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2 Great Neural Net Tutorials:

(please subscribe for more videos like these! )

1. https://medium.com/technology-invention-and-more/how-to-build-a-simple-neural-network-in-9-lines-of-python-code-cc8f23647ca1#.l51z38s7f

2. https://iamtrask.github.io/2015/07/12/basic-python-network/

Awesome Tutorial Series on Neural Networks:

http://lumiverse.io/series/neural-networks-demystified

The Canonical Machine Learning Course:

https://www.coursera.org/learn/machine-learning

Curious just how inspired neural networks are from brain architecture? Take some time to learn about the human brain! This is my favorite intro to neuroscience course:

https://www.mcb80x.org/
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35 thoughts on “Build a Neural Net in 4 Minutes”

  2. wait how do I get the pyton version like yours mine looks like the one that you get when downloading windows and the one they use in the matrix with the green letters and black background I forgot what it's called?

  10. I think you should do 40mins video of the same thing exactly – but this time SLOWER…. MUCH MUCH SLOWER….And with more details. Only THEN it'll be a good video. As speed is not the target here – but understanding.

  12. wait… why does the sigmoid function look like that? I thought it was simply:

    def sigmoid(x):
    return 1/(1 + .exp(-x) )

    And if that if statement and stuff make it function better, I'd be really really nice if you could explain it. Sorry if this comment is overly stupid all this neural network stuff is really hard 🙁

    Also, I can see you imported numpy as numpy, but because of your habit you started using np from the middle 😛 ……. or is there a meaning to that too??

  13. Something similar in javascript???? How to keep the experience that neural network has got, so next time you run it it remembers all the previous training and can continue to train more for a better result?

  22. Hi Siraj,
    I appreciate your effort to educate people.
    Looks like your verbal delivered code and github codes are different. Please upload the same code or email to me.
    Thanks

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