Theano in Python Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Theano is a Python library that allows us to evaluate mathematical operations including multi-dimensional arrays efficiently. It is mostly used in building Deep Learning Projects. Theano works way faster on the Graphics Processing Unit (GPU) rather than on the CPU. This article will help you to understand What is Theano in Python and how to install and work with Theono in Python. Theano in PythonTheano attains high speeds that give tough competition to C implementations for problems involving large amounts of data. It can take advantage of GPUs, making it perform better than C on a CPU by considerable orders of magnitude under certain circumstances. Theano also knows how to take structures and convert them into very efficient code that uses Numpy and some native libraries. It is mainly designed to handle the types of computation required for large neural network algorithms used in Deep Learning. That is why, Theanos is a trendy library in the field of Deep Learning. How to install Theano?Before installing Theano in your system, You need to make sure that Python and Numpy is already installed in your system. To install Python , You can refer to this article. How to download and install Python Latest Version on Windows To install NumPy in your system , You can refer to these below mentioned articles. How to Install Numpy on Windows?How to Install Numpy on Linux?How to Install Numpy on MacOS?To install Theano, You need to run this command in your terminal. pip install theano Several symbols we will need to use are in the tensor subpackage of Theano. We often import such packages with a handy name, let's say, T. from theano import * import theano.tensor as T Why Theano Python Library ?Theano is a sort of hybrid between numpy and sympy, an attempt is made to combine the two into one powerful library. Some advantages of theano are as follows: Stability Optimization: Theano can find out some unstable expressions and can use more stable means to evaluate them.Execution Speed Optimization: As mentioned earlier, theano can make use of recent GPUs and execute parts of expressions in your CPU or GPU, making it much faster than Python.Symbolic Differentiation: Theano is smart enough to automatically create symbolic graphs for computing gradients.Basics of Theano Theano is a Python library that allows you to define, optimize, and evaluate mathematical expressions involving multi-dimensional arrays efficiently. Some Theano implementations are as follows. Subtracting two scalars Python program showing subtraction of two scalars Python import theano from theano import tensor # Declaring variables a = tensor.dscalar() b = tensor.dscalar() # Subtracting res = a - b # Converting it to a callable object # so that it takes matrix as parameters func = theano.function([a, b], res) # Calling function assert 20.0 == func(30.5, 10.5) It will not provide any output as the assertion of two numbers matches the number given, hence it results into a true value. Adding two scalars Python # Python program showing # addition of two scalars # Addition of two scalars import numpy import theano.tensor as T from theano import function # Declaring two variables x = T.dscalar('x') y = T.dscalar('y') # Summing up the two numbers z = x + y # Converting it to a callable object # so that it takes matrix as parameters f = function([x, y], z) f(5, 7) Output: array(12.0) Adding two matrices Python program showing addition of two matrices. Python import numpy import theano.tensor as T from theano import function x = T.dmatrix('x') y = T.dmatrix('y') z = x + y f = function([x, y], z) f([[30, 50], [2, 3]], [[60, 70], [3, 4]]) Output: array([[ 90., 120.], [ 5., 7.]]) Logistic function using theano : Let’s try to compute the logistic curve, which is given by: Logistic Function Python program to illustrate logistic sigmoid function using theano Python # Load theano library import theano from theano import tensor # Declaring variable a = tensor.dmatrix('a') # Sigmoid function sig = 1 / (1 + tensor.exp(-a)) # Now it takes matrix as parameters log = theano.function([a], sig) # Calling function print(log([[0, 1], [-1, -2]])) Output : [[0.5 0.73105858 0.26894142 0.11920292]] Theano is a foundation library mainly used for deep learning research and development and directly to create deep learning models or by convenient libraries such as Keras. It supports both convolutional networks and recurrent networks, as well as combinations of the two. ConclusionIn the dynamic landscape of deep learning, Theano shines as a versatile and efficient library. As we continue to delve into the intricacies of AI, Theano remains a steadfast ally, propelling us into a future where innovation knows no bounds. Comment More infoAdvertise with us Next Article Gradient Descent Algorithm in Machine Learning A aishwarya.27 Follow Improve Article Tags : Python Python-Library Practice Tags : python Similar Reads Deep Learning Tutorial Deep Learning is a subset of Artificial Intelligence (AI) that helps machines to learn from large datasets using multi-layered neural networks. It automatically finds patterns and makes predictions and eliminates the need for manual feature extraction. 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