Deep learning

Tensorflow for ruby

https://news.ycombinator.com/item?id=12603890


https://medium.com/@Arafat./introducing-tensorflow-ruby-api-e77a477ff16e

https://github.com/somaticio/tensorflow.rb

https://medium.com/@Arafat./image-recognition-in-ruby-tensorflow-df5d5c05389b

Awesome Machine Learning with Ruby

https://github.com/arbox/machine-learning-with-ruby

kerl

	#View erl's version
	erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().' -noshell
	#Install kerl
	$ brew install kerl
	# list releases
	$ kerl list releases
	$ kerl build R16B03 build-R16B03
	$ kerl list builds
	$ kerl install build-R16B03 ~/erlang/R1603/
	Installing Erlang/OTP R16B03 (build-R16B03) in /Users/ioannis/erlang/R1603...
	You can activate this installation running the following command:
	. /Users/ioannis/erlang/R1603/activate
	Later on, you can leave the installation typing:
	kerl_deactivate
	$ kerl list installations
	build-R16B03 /Users/ioannis/erlang/R1603
	ioannis@MacBook-Pro ~ ⚡️ which erl
	/Users/ioannis/erlang/R1603/bin/erl
	ioannis@MacBook-Pro ~ ⚡️ erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().' -noshell
	"R16B03"

view raw kerl.sh hosted with ❤ by GitHub

https://github.com/kerl/kerl

quick graphql implementation for grape gem Raw

	module Grape
	module Formatter
	module Json
	class << self
	def call(object, _env)
	only = _env[Grape::Env::RACK_REQUEST_QUERY_HASH]["__only__"]
	if object.respond_to?(:to_json)
	return only.present? ? object.to_json(only: only) : object.to_json
	end
	MultiJson.dump(object)
	end
	end
	end
	end
	end
	# a = [:id, jobs: [:id, country: :id]].to_query('__only__')
	# => "__only__%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D%5Bcountry%5D=id"
	# http://localhost:9292/bundles/68?__only__%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D=id&__only__%5B%5D%5Bjobs%5D%5B%5D%5Bcountry%5D=id

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About gRPC

gRPC is a modern open source high performance RPC framework that can run in any environment. It can efficiently connect services in and across data centers with pluggable support for load balancing, tracing, health checking and authentication. It is also applicable in last mile of distributed computing to connect devices, mobile applications and browsers to backend services.



https://grpc.io/about/

PRINCIPLES OF CHAOS ENGINEERING

CHAOS IN PRACTICE

To specifically address the uncertainty of distributed systems at scale, Chaos Engineering can be thought of as the facilitation of experiments to uncover systemic weaknesses.  These experiments follow four steps:

1. Start by defining ‘steady state’ as some measurable output of a system that indicates normal behavior.
2. Hypothesize that this steady state will continue in both the control group and the experimental group.
3. Introduce variables that reflect real world events like servers that crash, hard drives that malfunction, network connections that are severed, etc.
4. Try to disprove the hypothesis by looking for a difference in steady state between the control group and the experimental group.

The harder it is to disrupt the steady state, the more confidence we have in the behavior of the system.  If a weakness is uncovered, we now have a target for improvement before that behavior manifests in the system at large.

http://principlesofchaos.org/

ruby

• $! - latest error message
• $@ - location of error
• $_ - string last read by gets
• $. - line number last read by interpreter
• $& - string last matched by regexp
• $~ - the last regexp match, as an array of subexpressions
• $n - the nth subexpression in the last match (same as $~[n])
• $= - case-insensitivity flag
• $/ - input record separator
• $\ - output record separator
• $0 - the name of the ruby script file
• $* (or ARGV) - the command line arguments
• $$ - interpreter’s process ID
• $? - exit status of last executed child process
• $-i $-l $-p $-v - Command line switches
• $-v (or $VERBOSE) - verbose mode

Installing graphite and statsd on OS X Yosemite Raw

Prerequisites

• Homebrew
• Python 2.7
• Git

Graphite

Install Cairo

There's an issue with cairo 14.x that results in the axis fonts on the graphs being HUUUUUGE. Downgrading to 12.6 helps:

cd /usr/local/Library/
git checkout 7073788 /usr/local/Library/Formula/cairo.rb
brew install cairo
brew install py2cairo
sudo pip install cairocffi

Install Django

pip install Django==1.8
pip install django-tagging

Install Graphite

sudo pip install carbon
pip install whisper
sudo pip install graphite-web
sudo pip install Twisted==15.2

sudo chown -R <your username>:staff /opt/graphite

Configure graphite

cd /opt/graphite
cp conf/carbon.conf{.example,}
cp conf/storage-schemas.conf{.example,}

cd webapp/graphite

# Modify this file to change database backend (default is sqlite).
cp local_settings.py{.example,}

# Initialize database
python manage.py syncdb

Start carbon & graphite

python /opt/graphite/bin/carbon-cache.py start

(Ignore this error: WHISPER_FALLOCATE_CREATE is enabled but linking failed.)

python /opt/graphite/bin/run-graphite-devel-server.py /opt/graphite

Hope that it works!

Go to:

http://localhost:8080

You should see this if it works properly:

If you get a broken image, it most likely means that something is wrong py2cairo and cairo.

Check the debug output here:

http://localhost:8080/render

Optional convenience aliases

Add this to your .bashrc or .bash_profile or .aliasrc:

alias carbon='python /opt/graphite/bin/carbon-cache.py'
alias graphite-web='python /opt/graphite/bin/run-graphite-devel-server.py /opt/graphite'

Statsd

Install Node

brew install nodejs

Clone the repo

sudo git clone https://github.com/etsy/statsd.git /opt/statsd
sudo chown -R trusche:staff /opt/statsd

Configure statsd

cp /opt/statsd/exampleConfig.js /opt/statsd/config.js

Fire it up!

node /opt/statsd/stats.js /opt/statsd/config.js

node statsd /

Resources

• https://github.com/etsy/statsd
• http://graphite.wikidot.com/installation
• http://stackoverflow.com/questions/6886578/how-to-install-pycairo-1-10-on-mac-osx-with-default-python
• http://www.spacevatican.org/2012/9/18/using-statsd-and-graphite-from-a-rails-app/

view raw statsd.md hosted with ❤ by GitHub

Kill all IRB and PRY process Raw

	ps -ef | grep 'irb' | awk '{print $2}' | xargs kill -9
	ps -ef | grep 'pry' | awk '{print $2}' | xargs kill -9

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