Recurrent Neural Networks Tutorial, Part 2 – Implementing a RNN with Python, Numpy and Theano | WildML

Link:

index_to_word=[1,2,1,2,3]

>>> dict([(w,i) for i,w in enumerate(index_to_word)])

{1: 2, 2: 3, 3: 4}

>>> enumerate(index_to_word)

<enumerate object at 0x7f15df7d9870>

>>> [(w,i) for i,w in enumerate(index_to_word)]

[(1, 0), (2, 1), (1, 2), (2, 3), (3, 4)]

Note:

enumerate():

A new built-in function, enumerate(), will make certain loops a bit clearer. enumerate(thing), where thing is either an iterator or a sequence, returns a iterator that will return (0,thing[0]), (1, thing[1]), (2, thing[2]), and so forth.
A common idiom to change every element of a list looks like this:

for i in range(len(L)):
    item = L[i]
    # ... compute some result based on item ...
    L[i] = result

This can be rewritten using enumerate() as:

for i, item in enumerate(L):
    # ... compute some result based on item ...
    L[i] = result

https://docs.python.org/2.3/whatsnew/section-enumerate.html


ERROR:

To start the Jupyter Notebook:

# Clone the repo
git clone https://github.com/dennybritz/rnn-tutorial-rnnlm
cd rnn-tutorial-rnnlm

# Create a new virtual environment (optional, but recommended)
virtualenv venv
source venv/bin/activate

I have trouble to run the following 
# Install requirements
pip install -r requirements.txt
# Start the notebook server
jupyter notebook

After running:
pip install -r requirements.txt

It give errors:
  Could not find a version that satisfies the requirement functools32==3.2.3.post2 (from -r requirements.txt (line 6)) (from versions: 3.2.3-1, 3.2.3-1, 3.2.3-2, 3.2.3-2)
Cleaning up...
No distributions matching the version for functools32==3.2.3.post2 (from -r requirements.txt (line 6))
Storing debug log for failure in /home/username/.pip/pip.log

Then I go to the following place:
https://pypi.python.org/packages/source/f/functools32/functools32-3.2.3-2.tar.gz#md5=09f24ffd9af9f6cd0f63cb9f4e23d4b2

to download functools32-3.2.3-2.tar.gz
after untar,
use the following command to

sudo python setup.py install

It actually install sth under the following dir:

/usr/local/lib/python2.7/dist-packages/functools32

Solution:

Following the official website of:

http://jupyter.readthedocs.org/en/latest/install.html#existing-python-new-jupyter

pip install -U jupyter