Lasagne provides a high-level API for creating neural networks using Theano on the backend
Theano is a numerical computation library for Python
"It is similar in spirit to keras which is built as a high-level api on top of theano tensorflow cntk although the main difference is that lasagne implements only one backend allowing it to integrate more deeply with theano features"
from question "* (no title is found for this review)"
"And using keras or lasagne is way simpler to develop nns then pure theano which was just side research project in montreal to support development of pylearn"
from question "Relationship between Keras, Lasagne, Block and Theano?"