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class Leaf {
  constructor() {
    this.pos = createVector(random(width), random(height));
    this.reached = false;
  }

  show() {
    fill(255, 255, 0);
    noStroke();
    ellipse(this.pos.x, this.pos.y, 8, 8);

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class Tensor:
    ...
    def backward(self):
        # topological order all of the parents in the graph
        topo = []
        visited = set()
        def build_topo(v):
            if v not in visited:
                visited.add(v)
                for parent in v._prev:

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class Tensor:
    def __init__(self, data, _parents=(), _op=''):
        self.data = data
        self.grad = 0
        self._backward = lambda: None
        # A set that contains previous (parent) nodes that produced 
        # the current node with operation _op
        self._prev = set(_parents)
        self._op = _op

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class Tensor:
    def __init__(self, data, _parents, _op):
        ...
    def sigmoid(self):
        sigm = 1.0/(1 + np.exp(-self.data))
        out = Tensor(sigm, _parents=(self,), _op="σ")
        def _backward():
            self.grad = sigm * (1 - sigm)
        out._backward = _backward
        return out

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Step 1: Server Credentials

This assumes you are now connected to the server via SSH.

• sudo -s Enter root mode for admin access
• groupadd devgroup Create new group to be later granted access to /var/www/html

Creating a new Root User

• useradd -G root,devgroup masterdev Create new root user. Also add to the devgroup
• passwd masterdev Change password for the new root user
• At this point, you'll need to input your new root user's new password

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

logancyang

Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.

The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]: