Victornovikov

Calculus

Matrix derivatives

• A good collection of links on matrix derivatives https://gist.github.com/yig/c1959ce997f1d2fd6f3f982cb482e060

• A gentle intro. This series gives an overview of gradient, Jacobian and importance of chain rule for NN

  • https://www.lesswrong.com/posts/9L9XuXhLYBm47yYkf/a-primer-on-matrix-calculus-part-1-basic-review

• https://www.lesswrong.com/s/nMGrhBYXWjPhZoyNL/p/KKwv9kcQz29vqPLAD

yig

matrix derivatives via Frobenius norm

# Automatic matrix derivatives: http://www.matrixcalculus.org/

# A good primer on basic matrix calculus: https://atmos.washington.edu/~dennis/MatrixCalculus.pdf
# The Matrix Reference Manual: http://www.ee.ic.ac.uk/hp/staff/dmb/matrix/intro.html#Intro
# Trying to understand the derivative of the inverse: https://math.stackexchange.com/questions/1471825/derivative-of-the-inverse-of-a-matrix
# Derivative of the pseudoinverse:
    https://math.stackexchange.com/questions/2179160/derivative-of-pseudoinverse-with-respect-to-original-matrix
    https://mathoverflow.net/questions/25778/analytical-formula-for-numerical-derivative-of-the-matrix-pseudo-inverse

yi-jiayu

import time

from telethon import TelegramClient, events

# sample API_ID from https://github.com/telegramdesktop/tdesktop/blob/f98fdeab3fb2ba6f55daf8481595f879729d1b84/Telegram/SourceFiles/config.h#L220
# or use your own
api_id = 17349
api_hash = '344583e45741c457fe1862106095a5eb'

# fill in your own details here

daviderestivo

(defun drestivo/org-download-method (link)
  "This is an helper function for org-download.
It creates an \"./image\" folder within the same directory of the org file.
Images are separated inside that image folder by additional folders one per
org file.
More info can be found here: https://github.com/abo-abo/org-download/issues/40.
See the commit message for an example:
https://github.com/abo-abo/org-download/commit/137c3d2aa083283a3fc853f9ecbbc03039bf397b"
  (let ((filename
         (file-name-nondirectory

timvieira

"""
Simple example of manually performing "automatic" differentiation
"""
import numpy as np
from numpy import exp, sin, cos


def f(x, with_grad=False):
    # Need to cache intermediates from forward pass (might not use all of them).
    a = exp(x)

adham90

SPC s c remove highlight

**** Files manipulations key bindings
Files manipulation commands (start with ~f~):

| Key Binding | Description                                                    |
|-------------+----------------------------------------------------------------|
| ~SPC f c~   | copy current file to a different location                      |
| ~SPC f C d~ | convert file from unix to dos encoding                         |
| ~SPC f C u~ | convert file from dos to unix encoding                         |

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

crittelmeyer

Vim Cheatsheet

As configured in my dotfiles

Intro Resources

• Your problem with Vim is that you don't grok vi (on StackOverflow)
• Coming Home to Vim
• VimCasts.org
• Vim Galore
• Vim Adventures!

brijeshb42

import os
import json
import datetime

from flask import Flask, url_for, redirect, \
    render_template, session, request
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.login import LoginManager, login_required, login_user, \
    logout_user, current_user, UserMixin
from requests_oauthlib import OAuth2Session

soheilhy

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers