As data scientists and researchers, we are constantly looking for ways to make our work more efficient and effective. One important tool in our arsenal is the Blas library, which stands for Basic Linear Algebra Subprograms. It is a collection of routines that perform common linear algebra operations such as matrix multiplication and vector addition.
But what does Blas have to do with Numpy? Numpy is a popular numerical computing library in Python, and it relies heavily on Blas for its linear algebra computations. By using Blas, Numpy can perform these computations much faster than if it were to use only its own implementation.
So, why should we take the time to learn about Blas when we already have Numpy? Well, understanding how Blas works can help us optimize our code even further. Numpy uses Blas under the hood, but we can also use it directly to access its full range of functionality. By doing this, we can customize our linear algebra computations for maximum efficiency and speed.
If you are interested in improving your data analysis and computational skills, then learning about the Blas library used by Numpy is a must. Whether you are a beginner or an experienced data scientist, understanding the basics of linear algebra and how it relates to Blas and Numpy can greatly enhance your abilities. So, dive into this article to discover more about Blas and how we can use it to take our work to the next level.
“Find Out If/Which Blas Library Is Used By Numpy” ~ bbaz
Introduction
When it comes to scientific computing in Python, the NumPy library is one of the most widely used libraries. NumPy stands for Numerical Python and provides an extensive set of mathematical functions that are specifically designed to operate on arrays and matrices of numerical data. One of the key features of NumPy is its use of BLAS (Basic Linear Algebra Subprograms) libraries, which provide functions for performing basic linear algebra operations on vectors and matrices.
What is BLAS?
BLAS stands for Basic Linear Algebra Subprograms, and it is a set of lowlevel routines for performing common linear algebra operations such as matrix multiplication, vector addition, and elementwise multiplication. By providing efficient implementations of these basic operations, BLAS libraries form the foundation of many other linear algebra libraries.
The Different Levels of BLAS
BLAS libraries are generally divided into three levels, each providing progressively more complex operations:
Level  Operations 

Level 1  Vectorvector operations (e.g., dot product) 
Level 2  Matrixvector operations (e.g., matrixvector multiplication) 
Level 3  Matrixmatrix operations (e.g., matrixmatrix multiplication) 
NumPy’s Use of BLAS Libraries
NumPy uses BLAS libraries to perform many of its linear algebra operations. When NumPy is installed, it will automatically try to link to an available BLAS library on the system. If no BLAS library is found, NumPy still works but may be slower at certain operations.
Performance Comparison of BLAS Libraries
There are many different BLAS libraries available, each optimized for different hardware architectures and providing varying levels of performance. Some popular BLAS libraries include:
 OpenBLAS
 ATLAS
 Intel MKL
 Apple Accelerate Framework
The performance of these libraries can vary widely depending on factors such as the size of the matrices being multiplied, the number of processor cores being used, and the hardware architecture of the system. In general, however, some benchmarks have shown that Intel MKL tends to be one of the fastest BLAS libraries for certain operations on Intel hardware.
Choosing a BLAS Library for NumPy
In general, most users of NumPy will not need to worry about which BLAS library is being used under the hood. However, in cases where performance is critical, or where certain linear algebra operations are not supported by the default BLAS library, it may be advantageous to link to a different BLAS library.
To choose a different BLAS library for NumPy, users can rebuild NumPy from source and specify the desired BLAS library using a commandline option. Alternatively, some installations of NumPy come with a configuration tool that allows users to specify the BLAS library to be used.
Conclusion
NumPy’s use of BLAS libraries provides a highperformance foundation for many of its linear algebra operations. While most users will not need to worry about which BLAS library is being used, the choice of BLAS library can be important in certain cases where performance or functionality is critical. By understanding the basics of BLAS and its use in NumPy, users can make informed decisions about which BLAS library to use for their specific needs.
References
 https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms
 https://numpy.org/doc/stable/user/blas.html
 https://software.intel.com/content/www/us/en/develop/articles/intelmklandopenblasperformancecomparison.html
Thank you for taking the time to read about the Blas library and how it’s used by Numpy. We hope that this article has given you a better understanding of how this powerful library contributes to the speed and efficiency of numerical computations in Python.
Whether you’re working on complex scientific simulations or simply crunching numbers for data analysis, having access to libraries like Blas can significantly improve your workflow and help you achieve faster and more accurate results. With Numpy, you can easily incorporate Blas into your Python code and take advantage of its many benefits.
If you have any questions or would like to learn more about Blas and how it can be used with Numpy, we encourage you to explore the many resources available online. From tutorials and documentation to community forums and chat rooms, there’s no shortage of information to help you get started with this powerful library. We wish you all the best as you continue to explore the world of numerical computing with Python!
People Also Ask about Discover the Blas Library Used by Numpy

What is the Blas library used by Numpy?
The Basic Linear Algebra Subprograms (BLAS) is a library of routines for performing basic vector and matrix operations. Numpy uses the BLAS library to speed up its linear algebra computations.

Why does Numpy use the Blas library?
The BLAS library provides optimized routines for linear algebra operations, such as matrix multiplication and inversion. By using the BLAS library, Numpy can perform these operations faster and more efficiently.

How does Numpy use the Blas library?
Numpy uses the Blas library through its underlying linear algebra functions, such as dot(), matmul(), and inv(). These functions call the appropriate BLAS routines to perform the required linear algebra operations.

Can I use Numpy without the Blas library?
Yes, you can use Numpy without the BLAS library. However, this may result in slower performance for linear algebra operations.

Is the Blas library open source?
Yes, the BLAS library is open source and freely available to use and modify.