Skip to content

Instantly share code, notes, and snippets.

Avatar

simsicon

  • Alipay
  • Shanghai
View GitHub Profile
@karpathy
karpathy / min-char-rnn.py
Last active Aug 9, 2020
Minimal character-level language model with a Vanilla Recurrent Neural Network, in Python/numpy
View min-char-rnn.py
"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np
# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)
@keis
keis / coro.py
Created Apr 14, 2014
asyncio examples
View coro.py
import asyncio
@asyncio.coroutine
def waiting(r):
print("hello from waiting -", r)
yield from asyncio.sleep(2)
print("bye from waiting -", r)
return r
@jamesgary
jamesgary / gist:5504424
Created May 2, 2013
Dissecting Ruby with Ruby - Richard Schneeman (@schneems) - RailsConf2013
View gist:5504424

Dissecting Ruby with Ruby

Richard Schneeman (@schneems)

  • Get into a library
    • bundle open wicked
    • Make sure you've set your $EDITOR
  • Forget fancy debuggers
    • All you need is puts
    • A rubyist's tracer round: puts "================="
  • Notation
@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 — forked from jboner/latency.txt
Latency numbers every programmer should know
View latency.markdown

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns  = 250 µs
@jboner
jboner / latency.txt
Last active Aug 12, 2020
Latency Numbers Every Programmer Should Know
View latency.txt
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@isaacbowen
isaacbowen / will_paginate.rb
Created Aug 30, 2011
extends will_paginate to play well with Twitter's Bootstrap
View will_paginate.rb
# config/initializers/will_paginate.rb
module WillPaginate
module ActionView
def will_paginate(collection = nil, options = {})
options[:renderer] ||= BootstrapLinkRenderer
super.try :html_safe
end
class BootstrapLinkRenderer < LinkRenderer
View capybara cheat sheet
=Navigating=
visit('/projects')
visit(post_comments_path(post))
=Clicking links and buttons=
click_link('id-of-link')
click_link('Link Text')
click_button('Save')
click('Link Text') # Click either a link or a button
click('Button Value')
You can’t perform that action at this time.