Jerry Zhi-Yang He hzyjerry

Deploy your site with git

This gist assumes:

you have an online remote repository (github / bitbucket etc.)
you have a local git repo
and a cloud server (Rackspace cloud / Amazon EC2 etc)
- your (PHP) scripts are served from /var/www/html/
- your webpages are executed by Apache
the Apache user is named www-data (may be apache on other systems)

Code used to obtain these results can be found at the url https://github.com/joschu/modular_rl, commit 50cdfdf375e69d86e3db6eb2ad0218ea6aebf371. The command line expression used for all the environments can be found in the text file below. Note that the same exact parameters and policies were used for all tasks, except for timesteps_per_batch, which was varied based on the difficulty of the task. The important parameters are:

gamma=0.995: discount
lam=0.97: see GAE paper for explanation
agent=TrpoAgent: name of the class, which specifies policy and value function architecture. In this case, we used two hidden layers of size 64, with tanh activations
cg_damping: multiple of the identity added for conjugate gradient

Install ImageMagick

brew install ImageMagick

Pull specific region of frames from video file w/ ffmpeg

ffmpeg -ss 14:55 -i video.mkv -t 5 -s 480x270 -f image2 %04d.png

-ss 14:55 gives the timestamp where I want FFmpeg to start, as a duration string.
-t 5 says how much I want FFmpeg to decode, using the same duration syntax as for -ss.
-s 480x270 tells FFmpeg to resize the video output to 480 by 270 pixels.
-f image2 selects the output format, a series of still images — make sure there are leading zeros in filename.

In this article, I will share some of my experience on installing NVIDIA driver and CUDA on Linux OS. Here I mainly use Ubuntu as example. Comments for CentOS/Fedora are also provided as much as I can.

Simple automated GIT Deployment using GIT Hooks

Here are the simple steps needed to create a deployment from your local GIT repository to a server based on this in-depth tutorial.

How it works

You are developing in a working-copy on your local machine, lets say on the master branch. Most of the time, people would push code to a remote server like github.com or gitlab.com and pull or export it to a production server. Or you use a service like deepl.io to act upon a Web-Hook that's triggered that service.

How to install Ubuntu 14.04.05 on Alienware 15 R3

Tiny guide to install Ubuntu 14.04.05 on a brand new Alienware 15 R3.

Let windows 10 install

Just next, next, next filling up your data.

You should get a BIOS update alert from the Alienware Update widget. If not, right click on the Down arrow icon in the bottom right extra icons ^ thing and right click, then click Check for Updates.

	#!/bin/bash

	# generate new personal ed25519 ssh keys
	ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519 -C "rob thijssen <[email protected]>"
	ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_robtn -C "rob thijssen <[email protected]>"

	# generate new host cert authority (host_ca) ed25519 ssh key
	# used for signing host keys and creating host certs
	ssh-keygen -t ed25519 -f manta_host_ca -C manta.network

	#!/bin/bash
	#
	# git-mv-with-history -- move/rename file or folder, with history.
	#
	# Moving a file in git doesn't track history, so the purpose of this
	# utility is best explained from the kernel wiki:
	#
	# Git has a rename command git mv, but that is just for convenience.
	# The effect is indistinguishable from removing the file and adding another
	# with different name and the same content.

	import boto.mturk.connection

	sandbox_host = 'mechanicalturk.sandbox.amazonaws.com'
	real_host = 'mechanicalturk.amazonaws.com'

	mturk = boto.mturk.connection.MTurkConnection(
	aws_access_key_id = 'XXX',
	aws_secret_access_key = 'XXX',
	host = sandbox_host,
	debug = 1 # debug = 2 prints out all requests. but we'll just keep it at 1