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10 Open Source Machine Learning Libraries

Machine Learning Open Source

The open-source movement is responsible for most of the technological innovation we see today, and machine learning is no exception. This movement has birthed many new libraries, fueled projects, enabled rapid growth, and increased the reproducibility of experimental results and innovative applications. In addition, these libraries have made it more feasible to design large-scale real-world systems and adopt models.

Let’s get started and see what we’ve got on our hands! Because there are a lot of open source machine learning libraries out there, we are only going to look at a few. Below is a list of various machine learning libraries and how they’ve changed the machine learning landscape.

  • Numpy
  • Pandas
  • SciPy
  • Scikit-learn
  • TensorFlow
  • Keras
  • PyTorch
  • Natural Language Toolkit (NLTK)
  • DanfoJS
  • Microsoft Cognitive Toolkit (CNTK)

1. Numpy

Numpy is one of the first libraries you’ll encounter when getting started with machine learning. Numpy, also known as numerical Python, was first developed by Travis Oliphant. This library is the go-to Python library for scientific computation, handling multi-dimensional array and matrix operations.

NumPy uses a special array type and brings the computational power of languages like C and Fortran to Python. Thus, it can perform various calculations like linear algebra, Fourier transform, and random number capabilities in milliseconds.

It also lies at the core and forms the basis of many data science libraries. So, for example, we have visualization libraries like Matplotlib, Seaborn, Plotly, Altair, and Bokeh; machine learning libraries like Scikit-learn and SciPy; and array libraries like Dash, PyTorch, TensorFlow, MXNet, and even Pandas.


  • Numpy arrays take less compact storage and memory space, so they have better runtime speeds when compared with traditional Python arrays.
  • Its integration with C, C++, and Fortran code.
  • It supports vectorized operations.
  • Its ability to handle Fourier transforms like linear algebra and random numbers.
  • Community support, especially since it is the foundation of multiple libraries.


  • It requires a contiguous allocation of memory.
import numpy as np

#creating an array wiith np.array
new_matrix = np.array([[1,2,3], [4,5,6], [7,8,9]])


Visit to learn more about this library and submit an open-source contribution today! I contribute to this project so you can reach out to me if you need help.

2. Pandas

You can’t say you haven’t heard of Pandas as a data scientist. Pandas is a fast and flexible data analysis and manipulation library developed by Wes McKinney. Pandas isn’t technically a machine learning library, unlike the other libraries on this list. However, it is needed for handling tabular data, data transformation, and performing EDA (Exploratory Data Analysis).

This library leverages high-level data structures (Series and DataFrame) and has multiple in-built data cleaning and analysis methods. Panda methods cut down complex Python calculations into a few lines of code. You can pretty much call it the Microsoft Excel of Python. Besides data manipulation, Pandas is very handy for data visualization.

To get a feel for Pandas in action, check out feature engineering for categorical data, build an article recommendation system using Python, and data analytics with Pandas 🐼.


  • Efficient handling of huge data sets for EDA.
  • Its code and data structures are simple, fast, and flexible.
  • It integrates easily with other libraries in the machine learning ecosystem.
  • It has an extensive set of inbuilt commands.


  • Poor 3D matrix compatibility.
import pandas as pd

df = pd.DataFrame({"A":[1, 10, 100, 1000, 10000],
                   "B":[2, 20, 200, 2000, 20000], 
                   "C":[3, 30, 300, 3000, 30000],
                   "D":[4, 40, 400, 4000, 40000]})

#return the mean absolute deviation of the values for the requested axis
df.mad(axis = 0)

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3. SciPy

Scientific Python, also known as SciPy, is used to perform scientific analysis and technical computing on large data sets. SciPy was developed by Travis Oliphant, Pearu Peterson, and Eric Jones. Array optimization, linear algebra, integration, interpolation, special functions, ODE solvers, FFT, and signal and image processing are among the modules in this Numpy-based library.


  • It’s easy to use and fast to execute.
  • Complex numerical operations
  • It has high-level commands with extensive functionality.


  • Despite being built on NumPy, Scipy has a slower computational speed.
from scipy import special

#exponential Function
x = special.exp10(1)


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4. Scikit-learn

Scikit-learn is home to many machine learning algorithms, model selection, and preprocessing features. Scikit-learn was written in C and Python and built on top of NumPy and SciPy. It was developed by David Cournapeau as a Google Summer of Code project. It is presently one of the most widely used machine learning libraries for developing machine learning algorithms.

The library is simple, robust, intuitive, and user-friendly. The library is straightforward, dependable, intuitive, and user-friendly. It’s also a useful library for building machine learning models, evaluating models, data modeling, and statistical modeling. This library can also vectorize text using BOW and hashing vectorization, among other things.

Check out fake news detection with Python, the best ways of splitting data for machine learning, how do I detect anomalies and why is it necessary? to get a sense of how Scikit-learn works in practice.


  • It’s a powerful model-building tool that’s relatively simple to use.
  • It is also highly adaptable and valuable for a variety of real-world situations.
  • Detailed API documentation.


  • It doesn’t support distributed computing for large-scale production environment applications very well.
  • It works only with numeric data and will require you to encode categorical data.
from sklearn import cluster, datasets

# load data
iris = datasets.load_iris()

# K-means clustering: create clusters for k=3
k_means = cluster.KMeans(k)

# fit data

# print results
print( k_means.labels_[::10])

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5. TensorFlow

Tensor is a library for building, training, and running deep learning models and neural networks. This library was developed by the Google Brain team. Its architecture and framework are also flexible; hence it can run across various computational platforms such as CPU, GPU, and TPU.

TensorFlow also offers a web-based visualization tool called Tensorboard, as well as frameworks like TensorFlow Lite and TensorFlow that make it easy to deploy machine learning models. You can visualize model parameters, gradients, and performance with Tensorboard.

Read Dropout Regularization with Tensorflow Keras to see Tensorflow in action.


  • Its TPU architecture allows it to outperform GPU and CPU in terms of computation speed.
  • It has top-notch computational graph visualization support.
  • It is compatible with Keras and various languages, such as C++, JavaScript, Python, C#, Ruby, and Swift.


  • Its TPU architecture only allows a model to be executed, not trained.
  • It has only NVIDIA and Python support for GPU.
import tensorflow as tf

# Create a Tensor.
hello = tf.constant("hello world")

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6. Keras

Keras, often called Python deep learning library, is used for developing and evaluating neural networks within deep learning and machine learning models. Keras was built by François Chollet. It supports multiple backend support: Tensorflow, Theano, and CNTK. Because of this, training neural networks is easier and can be done with fewer codes and configurations.

Keras has inbuilt features like cov2d, max-pooling layers, and data processing libraries. It also comes with a variety of pre-trained models and image classification models.

Interested in how Keras works? Check out Trump’s Twitter insults and build your first convolutional neural network to classify cats and dogs.


  • Keras simplifies the development of standard deep learning models.
  • It works seamlessly with various deep learning frameworks and supports different backends like Tensorflow, Theano, and CNTK.


  • High resource requirements.
  • Because it cannot perform low-level computations, it is frequently used with TensorFlow, Theano, and Microsoft CNTK.
  • Keras operates at a high level of abstraction; users cannot fully implement their own core algorithm.
import tensorflow as tf
from tensorflow import keras

#load dataset
mnist = tf.keras.datasets.mnist

#Build a machine learning model
model = tf.keras.models.Sequential([
  tf.keras.layers.Flatten(input_shape=(28, 28)),
  tf.keras.layers.Dense(100, activation='relu'),

Visit to learn more about this library and submit an open-source contribution today!

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7. PyTorch

PyTorch is a library that is used for deep learning. The library was developed by Adam Paszke, Sam Gross, Soumith Chintala, and Gregory Chanan. It offers various tools for machine learning, computer vision, and natural language processing (NLP). PyTorch can also generate computational graphs and execute tensor computations using GPU acceleration.

Currently, PyTorch is managed by Meta AI, formerly called FAIR (Facebook AI Research lab).


  • It provides a solid framework for creating computational graphs backed up by fast execution times.
  • It offers a data parallelism capability that allows you to split computing jobs over numerous CPUs or GPUs.
  • It is flexible, faster, and provides optimizations.


  • It lacks an interface for monitoring and visualization.
import torch

p_Tensor = torch.ones((2, 2))

#size of a Tensor

#resizing 2x2 Tensor to 4x1 
p_Tensor = p_Tensor.view(4) 


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8. Natural Language Toolkit (NLTK)

NLTK is a Python library for performing natural language processing (NLP) tasks. The library was developed by Steven Bird, Edward Loper, and Ewan Klein. One thing to keep in mind is that NLTK is a collection of sub-packages and modules rather than a single ML library. These modules enable you to perform a range of tasks. For example, sentence segmentation, stopword removal, word tokenization, entity recognition (NER), dependency parsing, sentiment analysis, and text classification.

Check out keyword extraction with Python to get started with NLTK.


  • It supports many languages compared to other natural language processing (NLP) libraries.
  • The architecture of NLTK is modular, with multiple sub-packages that can be applied to various NLP tasks.


  • It has no neural network models.
  • NLTK does not use semantic analysis for sentence tokenization.
from nltk.stem import PorterStemmer
#from nltk.tokenize import sent_tokenize, word_tokenize

ps = PorterStemmer()

text_words = ["tech","technology","technologized","techy", "Technologization"]

for x in text_words:

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9. Danfo.JS

Danfo.js is a JavaScript library for manipulating and processing structured data. It provides high-performance, intuitive, and simple-to-use data structures. The library is based on TensorFlow.js and is greatly inspired by Pandas. This library was developed by Rising Odegua and Stephen Oni.

This library is handy especially because it enables developers to create JavaScript applications for machine learning and deep learning.


  • It has high-performance and user-friendly data structures.
  • It supports tensors.
  • It makes it simple for web-based apps to support machine learning features.
  • It provides JavaScript developers with data processing, machine learning, and AI tools.


  • It possesses low-level arithmetic operations.
npm install danfojs-node

import * as dfd from "danfojs-node"

#creating a DataFrame/Series
s = new dfd.Series([1, 3, 5, undefined, 6, 8])

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10. Microsoft Cognitive Toolkit (CNTK)

Microsoft CNTK is a deep learning model and algorithm training toolkit. It can be used as a standalone machine-learning tool as Brainscript or in Python and C++ projects. CNTK makes it simple to employ standard models, including feed-forward DNNs, convolutional neural networks (CNNs), and recurrent neural networks (RNNs/LSTMs) for voice training, handwriting recognition, and image recognition projects.


  • It has built-in components that are highly optimized for multi-dimensional dense or sparse data.
  • Its architecture supports GAN, RNN, and CNN.
  • It provides automatic hyperparameter tuning.


  • It lacks a visualization board.

Visit to learn more about this library and submit an open-source contribution today!

Final thoughts

Open-source libraries are essential, and they have revolutionized machine learning research. They’re used in various machine learning stacks, helped solve real-world problems, and have simplified the development of real-world projects.

If you enjoyed this post, you should try your hand at applying any of the libraries mentioned while using Comet’s machine learning platform to track, compare, and reproduce your machine learning experiments.

Thanks for reading!

Benny Ifeanyi Iheagwara

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