NLTK vs Theano: What are the differences?

Developers describe NLTK as "It is a leading platform for building Python programs to work with human language data". It is a suite of libraries and programs for symbolic and statistical natural language processing for English written in the Python programming language. On the other hand, Theano is detailed as "Define, optimize, and evaluate mathematical expressions involving multi-dimensional arrays efficiently". Theano is a Python library that lets you to define, optimize, and evaluate mathematical expressions, especially ones with multi-dimensional arrays (numpy.ndarray). Using Theano it is possible to attain speeds rivaling hand-crafted C impleme.

NLTK and Theano can be primarily classified as "Machine Learning" tools.

Theano is an open source tool with 8.87K GitHub stars and 2.5K GitHub forks. Here's a link to Theano's open source repository on GitHub.

According to the StackShare community, NLTK has a broader approval, being mentioned in 15 company stacks & 17 developers stacks; compared to Theano, which is listed in 5 company stacks and 10 developer stacks.