• sudo apt-get install python-software-properties
• sudo add-apt-repository ppa:git-core/ppa
• sudo apt-get update
• sudo apt-get install git

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step 0: X.509 certs

• AWS console >> Security Credentials >> ” X.509 Certificates ” tab
• Save private key and certs in ~/.ec2
• $ chmod go-rwx ~/.ec2/*.pem # set view rights on file
• Get account id @ page bottom

step 1: install EC2 terminal tools

• $ sudo apt-add-repository ppa:awstools-dev/awstools # update Personal Package Archive
• $ sudo apt-get update # update the apt-get program
• $ sudo apt-get install ec2-api-tools # install tools
• create new ~/.ec2 dir
• AWS console >> create new private key >> save in above dir

step 2: setup paths

• $ gedit ~/.bashrc
• paste this in: https://gist.github.com/1952353
• $ source ~/.bashrc
• $ ec2-describe-images -o self -o amazon # verify paths are correct

step 3: fire up instance

• http://uec-images.ubuntu.com/releases/10.04/release/ # list of published ubuntu AMIs
• $ ec2-run-instances ami-xxxxx -k ${EC2_KEYPAIR} -t <instance type> –region <aws region>
• $ ec2-run-instances ami-349b495d -k ${EC2_KEYPAIR} –instance-type t1.micro –region us-east-1
• $ ec2-run-instances ami-809a48e9 -k ${EC2_KEYPAIR} –instance-type m1.small –region us-east-1

step 4: Log in!

• $ ec2-describe-instances # get the name of your instance from here
• $ ec2-authorize default -p 22 # allow default SSH port
• $ ssh -i ~/.ec2/ec2.pem ubuntu@ec2-23-20-123-214.compute-1.amazonaws.com

step 5: Install shit!

step 6: Kill the server

• https://forums.aws.amazon.com/thread.jspa?messageID=326326񏪶

from: https://help.ubuntu.com/community/EC2StartersGuide

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STEP 0: Installing pre-requisites (setup on python 2.6.5)

Ensure you’ve got both Django and Python
• mimeparse
• $ sudo apt-get install python-lxml
• dateutil
• lxml

Note: Don’t name your project directory ‘api’

STEP 1: Djangin-Tastypie ( dev style bc you’re a good contributing programmer )

• $ cd ~/python_projects/
• $ git clone https://github.com/toastdriven/django-tastypie.git
• $ cp -r django-tastypie/ ~/django_projects/api/

STEP 2: Implement

• http://django-tastypie.readthedocs.org/en/latest/tutorial.html

STEP 3: Add the api

• $ python manage.py startapp sequence-api
• add this code to /sequence-api/models.py https://gist.github.com/1770411
• $ python manage.py sql sequence_api
• $ python manage.py syncdb

STEP 4: Verify installation

• $ python manage.py shell
• >> from sequence_api.models import Gene
• >> Gene.objects.all()

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Simple MCs
• http://bpgergo.blogspot.com/2012/01/monte-carlo-simulation-in-python.html
• http://remis-thoughts.blogspot.com/2011/10/monte-carlo-simulation-is-way-of.html

The above posts raises a slight issue with the Ruby script as the function being called will return a random float between 0 inclusive and 1 exclusive. Thus with a determining value being Heads for the set [0 , 0.5] and Tails for (0.5, 1) the script is slightly skewed towards Heads.

With the random.uniform(0,1) in Python we can get a little closer.. but we’re still not at a true random set of [0,1]. An additional workaround would be to scale the random seed according to the number of possible outcomes. It is safe to assume that uniform(0,1) is more biased than uniform(0,100000). Scale it to your set size and you’re good to go!

Not-so-simple MCs
• PyMC
• Cython Implementation

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I think this is going to be a cool way to go about learning statistics. Started on the first few problems @ khan and they’re doing an awesome job explaining the breakdown of statistics!

so far I’ve written some short programs for sample mean, sample standard deviation, population mean, and population standard deviation

http://bpaste.net/show/22474/

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Getting Django on Heroku prancing 8 times faster.

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STEP 0: Attempt to use example API call:

• $ curl -L -H ‘Expect:’ -H ‘Accept:text/xml’ -F seqdb=pdb -F algo=phmmer -F seq=’
• $ curl: (26) failed creating formpost data

So we’re working with a broken API call here … first off Google that error and we get back a mention of a curl “strace” operation

STEP 1: Run Curl strace

• $ strace curl -L -H ‘Expect:’ -H ‘Accept:text/xml’ -F seqdb=pdb -F algo=phmmer -F seq=’
• returns: http://pastie.org/3036474

Substantial amount of text there but lets work up from the bottom:

STEP 2: Problem?

• If i had to guess ln:448
• open(“test.seq”, O_RDONLY) = -1 ENOENT (No such file or directory)

STEP 3: HMMER expects test.seq file as input

• $ gedit test.seq
• paste in this code: http://pastie.org/3036784

STEP 4: Run it again!

• $ curl -L -H ‘Expect:’ -H ‘Accept:text/xml’ -F seqdb=pdb -F algo=phmmer -F seq=’
• Beautiful ! We get the expected output!

Note: additionally the sequence can be appended directly to the Curl HTTP request: http://pastie.org/3036798

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STEP 0: Install HamlPy

• $ sudo easy_install hamlpy

STEP 1: Install Sass

• $ cd ~/
• $ git clone git://github.com/nex3/sass.git
• $ cd sass/
• $ rake install
• $ cd ~/
• $ rm -rf sass/

STEP 2: Install Compass ( for this directory structure ) NOTE: ubuntu doesnt require quotes around the dir names

• $ gem install compass
• $ cd django_projects/mysite/static/
• $ compass install compass . --syntax sass --sass-dir sass --css-dir css --javascripts-dir javascripts --images-dir images
• youll get a console output like this: http://pastie.org/3028330
• Haml and Pythonize: http://pastie.org/3028383

STEP 3: Run Haml watcher

• $ cd django_projects/mysite/
• $ hamlpy-watcher templates/

STEP 4: Run Sass/Compass watcher ( in new terminal )

• $ cd ~/django_projects/mysite/
• $ compass watch

Notes:

• This setup all files need to be explicitly generated from their .haml and .sass formats using the watchers
• Uniike typical Ruby deployment run-time compilation of the css wont happen unless you’re running Ruby on your production servers
• Using two code bases: Compass/Sass with Django and HamlPy

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STEP 0: Only run this if you’ve attempted previous installations ( this will clean out the needed dirs )

• sudo rm -rf /usr/local/lib/python2.6/dist-packages/matplotlib*
• sudo rm -rf /usr/local/lib/python2.6/dist-packages/pylab*
• sudo rm -rf /usr/local/lib/python2.6/dist-packages/mpl_toolkits/mplot3d
• sudo rm -rf /usr/local/lib/python2.6/dist-packages/mpl_toolkits/axes_grid
• sudo rm -rf /usr/local/lib/python2.6/dist-packages/mpl_toolkits/axes_grid1
• sudo rm -rf /usr/local/lib/python2.6/dist-packages/mpl_toolkits/axisartist
• sudo rm /usr/local/lib/python2.6/dist-packages/mpl_toolkits/*.py

STEP 1: Tricky workaround to install the dependencies

• sudo apt-get build-dep python-matplotlib

STEP 2: Now we remove the old NumPy, while the installed dependencies remain

• sudo apt-get remove python-numpy

STEP 3: Download NumPy 1.6.1

• cd ~/
• wget http://downloads.sourceforge.net/project/numpy/NumPy/1.6.1/numpy-1.6.1.tar.gz

STEP 4: Install NumPy 1.6.1

• tar xzvf numpy-1.6.1.tar.gz
• cd numpy-1.6.1
• python setup.py build
• sudo python setup.py install

… And you’re all done!

Thanks to the original post on the ubuntu forums for this clever little work around and now to the hacking!

http://ubuntuforums.org/showthread.php?t=1573925

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STEP 0: Install prerequisite packages

• $ sudo apt-get install python-dev libxml2-dev swig libtool

STEP 1: Install GHMM

• $ svn co https://ghmm.svn.sourceforge.net/svnroot/ghmm/trunk/ghmm
• $ cd ghmm/
• $ sh autogen.sh
• $ ./configure
• $ make
• $ sudo make install

additional troubleshooting here:
http://www.linuxquestions.org/questions/linux-software-2/ghmm-library-277690/

original library:
http://ghmm.sourceforge.net/installation.html

Keywords: General Hidden Markov Model, Python, Artificial intelligence

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