What is the main purpose of Theano framework?

Theano is a Python library used for defining, optimizing, and evaluating mathematical expressions, primarily for research and development in deep learning and machine learning. It helps users build efficient mathematical expressions and accelerate calculations using Graphics Processing Units (GPUs). Theano also offers many optimization techniques to enhance the performance and efficiency of models. It is widely used for implementing deep learning algorithms, training and inference of neural networks, and other machine learning tasks.