├── Episode 02
    ├── program.py
    └── neuralnetwork.py
├── README.md
└── LICENSE


/Episode 02/program.py:
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1 | import neuralnetwork as nn
2 | import numpy as np
3 | 
4 | layer_sizes = (3,5,10)
5 | x = np.ones((layer_sizes[0],1))
6 | 
7 | net = nn.NeuralNetwork(layer_sizes)
8 | prediction = net.predict(x)


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/README.md:
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1 | # Neural-Network-python
2 | 
3 | Code for the tutorial series: [Neural Networks](https://www.youtube.com/playlist?list=PLFt_AvWsXl0frsCrmv4fKfZ2OQIwoUuYO "Youtube playlist")
4 | 
5 | Based on: http://neuralnetworksanddeeplearning.com/
6 | 


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/Episode 02/neuralnetwork.py:
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 1 | import numpy as np
 2 | 
 3 | class NeuralNetwork:
 4 | 
 5 | 	def __init__(self, layer_sizes):
 6 | 		weight_shapes = [(a,b) for a,b in zip(layer_sizes[1:],layer_sizes[:-1])]
 7 | 		self.weights = [np.random.standard_normal(s)/s[1]**.5 for s in weight_shapes]
 8 | 		self.biases = [np.zeros((s,1)) for s in layer_sizes[1:]]
 9 | 
10 | 	def predict(self, a):
11 | 		for w,b in zip(self.weights,self.biases):
12 | 			a = self.activation(np.matmul(w,a) + b)
13 | 		return a
14 | 
15 | 	@staticmethod
16 | 	def activation(x):
17 | 		return 1/(1+np.exp(-x))


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2018 Sebastian
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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