In this post

This note is updated frequently without notice!

## Create some fake data w.r.t. a function

```
# f(x) = log(x)
import numpy as np
x = np.random.uniform(1, 100, 1000)
y = np.log(x) + np.random.normal(0, .3, 1000)
```

## Graphviz export

- Download
**Graphviz**here. - Its online version.