Pi Day -- Calculate nth digit using neural net

# Calculate nth digit of Pi using neural net
We could imagine Pi as a array of integers
```
3141592653589793238462643383...
```
A possible cool way to calculate Pi is using a neural network with 1 input and 10 outputs, where the input n is the index of the nth digit and the output is the digit itself (one hot).
Some examples:
- 0 => [0,0,0,1,0,0,0,0,0,0]
- 4 => [0,0,0,0,0,1,0,0,0,0]
- 12 => [0,0,0,0,0,0,0,0,0,1]
- 50 => [1,0,0,0,0,0,0,0,0,0]
- 99 => [0,0,0,0,0,0,0,1,0,0]

You can use [this link](http://www.piday.org/million/) for the training data.