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Data Science

Data science is an inter-disciplinary field that uses scientific methods, processes, algorithms, and systems to extract knowledge from structured and unstructured data. Data scientists perform data analysis and preparation, and their findings inform high-level decisions in many organizations.

GitHub: https://github.com/topics/data-science
Wikipedia: https://en.wikipedia.org/wiki/Data_science
Related Topics: data-analysis, data-mining, machine-learning, big-data, data-visualization,
Aliases: datasciences, data-science-project, data-science-algorithm,
Last updated: 2024-07-29 13:36:33 UTC
JSON Representation

https://github.com/plotly/dash-cytoscape

Interactive network visualization in Python and Dash, powered by Cytoscape.js

bioinformatics biopython computational-biology cytoscape cytoscapejs dash data-science graph-theory network-graph network-visualization plotly plotly-dash

Last synced: 01 Aug 2024

https://github.com/datacleaner/DataCleaner

The premier open source Data Quality solution

data data-analysis data-science database datacleaner dataquality desktop etl mdm profiling

Last synced: 31 Jul 2024

https://github.com/dmbee/seglearn

Python module for machine learning time series:

data-science machine-learning python time-series

Last synced: 30 Jul 2024

https://dmbee.github.io/seglearn/

Python module for machine learning time series:

data-science machine-learning python time-series

Last synced: 01 Aug 2024

https://github.com/underneathall/pinferencia

Python + Inference - Model Deployment library in Python. Simplest model inference server ever.

ai artificial-intelligence computer-vision data-science deep-learning huggingface inference inference-server machine-learning model-deployment model-serving modelserver nlp paddlepaddle predict python pytorch serving tensorflow transformers

Last synced: 03 Aug 2024

https://github.com/Murgio/Food-Recipe-CNN

food image to recipe with deep convolutional neural networks.

chef classification cnn convolutional-neural-networks cooking-dishes data-science deep-learning dish food food-classification inceptionv3 jupyter-notebook keras machine-learning python3 recipes recognition tsne vgg vgg16

Last synced: 31 Jul 2024

https://github.com/siznax/wptools

Wikipedia tools (for Humans): easily extract data from Wikipedia, Wikidata, and other MediaWikis

api-client commons data-science glam linked-open-data mediawiki mediawiki-api open-data python restbase wikidata wikimedia-commons wikipedia wikipedia-api

Last synced: 01 Aug 2024

https://github.com/GRAAL-Research/poutyne

A simplified framework and utilities for PyTorch

data-science deep-learning keras machine-learning neural-network python pytorch

Last synced: 31 Jul 2024

https://github.com/LearnDataSci/articles

A repository for the source code, notebooks, data, files, and other assets used in the data science and machine learning articles on LearnDataSci

data-analysis data-science data-visualization machine-learning machine-learning-algorithms machinelearning python

Last synced: 01 Aug 2024

https://github.com/starpig1129/ai-data-analysis-mulitagent

AI-Driven Research Assistant: An advanced multi-agent system for automating complex research processes. Leveraging LangChain, OpenAI GPT, and LangGraph, this tool streamlines hypothesis generation, data analysis, visualization, and report writing. Perfect for researchers and data scientists seeking to enhance their workflow and productivity.

agent ai ai-data-analysis artificial-intelligence code-generation data-analysis data-analytics data-science langchain langgraph large-language-model large-language-models llm multiagent-systems python

Last synced: 17 Sep 2024

https://github.com/rushter/heamy

A set of useful tools for competitive data science.

data-science machine-learning stacking

Last synced: 03 Aug 2024

https://github.com/Kotlin/kandy

Kotlin plotting library.

data-science graphics jupyter-notebooks kotlin plot

Last synced: 01 Aug 2024

https://github.com/firmai/pandapy

PandaPy has the speed of NumPy and the usability of Pandas 10x to 50x faster (by @firmai)

algorithmic-trading arrays data-science data-structures finance machine-learning numpy pandas structured-data

Last synced: 01 Aug 2024

https://github.com/Lackoftactics/facebook_data_analyzer

Analyze facebook copy of your data with ruby language. Download zip file from facebook and get info about friends ranking by message, vocabulary, contacts, friends added statistics and more

conversation data-science data-visualization english-language facebook facebook-data facebook-data-analyzer ruby ruby-gem scraping script statistics

Last synced: 04 Aug 2024

https://github.com/achuthasubhash/Complete-Life-Cycle-of-a-Data-Science-Project

Complete-Life-Cycle-of-a-Data-Science-Project

analysis data-analysis data-science dataset deep-learning eda exploratory-data-analysis feature-engineering federated-learning machine-learning nlp-models python python-library pytorch reinforcement-learning scraper supervised-learning transfer-learning unsupervised-learning web-scraping

Last synced: 02 Aug 2024

https://github.com/csinva/csinva.github.io

Slides, paper notes, class notes, blog posts, and research on ML 📉, statistics 📊, and AI 🤖.

ai artificial-intelligence awesome blog computational-neuroscience data-science deep-learning jekyll-themes machine-learning machine-learning-tutorials ml neuroscience notes python pytorch research slides statistics stats website

Last synced: 10 Aug 2024

https://github.com/firmai/deltapy

DeltaPy - Tabular Data Augmentation (by @firmai)

augmentation data-augmentation data-science feature-engineering feature-extraction finance machine-learning tabular-data time-series

Last synced: 01 Aug 2024

https://github.com/pymc-labs/pymc-marketing

Bayesian marketing toolbox in PyMC. Media Mix (MMM), customer lifetime value (CLV), buy-till-you-die (BTYD) models and more.

btyd buy-till-you-die clv customer-lifetime-value data-science marketing media-mix-modeling mmm python

Last synced: 31 Jul 2024

https://github.com/bradleyboehmke/data-science-learning-resources

A collection of data science and machine learning resources that I've found helpful (I only post what I've read!)

data-science machine-learning

Last synced: 02 Aug 2024

https://hdi-project.github.io/ATM/

Auto Tune Models - A multi-tenant, multi-data system for automated machine learning (model selection and tuning).

automl data-science distributed-computing hyperparameter-optimization machine-learning

Last synced: 03 Aug 2024

https://github.com/HDI-Project/ATM

Auto Tune Models - A multi-tenant, multi-data system for automated machine learning (model selection and tuning).

automl data-science distributed-computing hyperparameter-optimization machine-learning

Last synced: 06 Aug 2024

https://github.com/justmarkham/pycon-2019-tutorial

Data Science Best Practices with pandas

data-science pandas python tutorial vizualisation

Last synced: 31 Jul 2024

https://github.com/MilesCranmer/SymbolicRegression.jl

Distributed High-Performance Symbolic Regression in Julia

automl data-science distributed-systems equation-discovery evolutionary-algorithms explainable-ai genetic-algorithm interpretable-ml julia machine-learning sciml symbolic symbolic-computation symbolic-regression

Last synced: 02 Aug 2024

https://github.com/aqueducthq/aqueduct

Aqueduct is no longer being maintained. Aqueduct allows you to run LLM and ML workloads on any cloud infrastructure.

ai data data-science kubernetes llm llms machine-learning ml ml-infrastructure ml-monitoring mlops orchestration python python3

Last synced: 17 Aug 2024

https://github.com/RunLLM/aqueduct

Aqueduct is no longer being maintained. Aqueduct allows you to run LLM and ML workloads on any cloud infrastructure.

ai data data-science kubernetes llm llms machine-learning ml ml-infrastructure ml-monitoring mlops orchestration python python3

Last synced: 01 Aug 2024

https://github.com/rpy2/rpy2

Interface to use R from Python

cffi data-science interoperability python r statistics

Last synced: 13 Aug 2024

https://github.com/HoloClean/holoclean

A Machine Learning System for Data Enrichment.

data-enrichment data-science inference-engine machine-learning pytorch

Last synced: 02 Aug 2024

https://github.com/youssefHosni/Efficient-Python-for-Data-Scientists

Writing clean and optimized Python code

data-science numpy pandas python

Last synced: 31 Jul 2024

https://github.com/ericlagergren/decimal

A high-performance, arbitrary-precision, floating-point decimal library.

arbitrary-precision big-decimal data-science decimal dogs-of-instagram financial general-decimal-arithmetic money multi-precision

Last synced: 04 Aug 2024

https://github.com/microsoft/Reactors

🌱 Join a community of developers at Microsoft Reactor and connect with people, skills, and technology to build your career or personal learning. We offer free livestreams, on-demand content, and hybrid/in-person events daily around the world. Access our projects and code here.

ai azure cloud data data-science devops dotnet events iot live-streaming low-code meetup mixed-reality ml no-code nodejs personal-de python web

Last synced: 02 Aug 2024

https://github.com/boxuancui/DataExplorer

Automate Data Exploration and Treatment

cran data-analysis data-exploration data-science eda r r-package rstats visualization

Last synced: 13 Aug 2024

https://github.com/scverse/anndata

Annotated data.

anndata bioinformatics data-science machine-learning scanpy scverse transcriptomics

Last synced: 01 Aug 2024

https://github.com/BCG-X-Official/facet

Human-explainable AI.

data-analytics data-science explainable-ai hyperparameter-tuning interpretability machine-learning model-selection python shap-vector-decomposition simulation statistics

Last synced: 03 Aug 2024

https://github.com/business-science/modeltime

Modeltime unlocks time series forecast models and machine learning in one framework

arima data-science deep-learning ets forecasting machine-learning machine-learning-algorithms modeltime prophet r-package tbats tidymodeling tidymodels time time-series time-series-analysis timeseries timeseries-forecasting

Last synced: 01 Aug 2024

https://github.com/SimonBlanke/Hyperactive

An optimization and data collection toolbox for convenient and fast prototyping of computationally expensive models.

automated-machine-learning bayesian-optimization data-science deep-learning feature-engineering hyperactive hyperparameter-optimization keras machine-learning model-selection neural-architecture-search optimization parallel-computing parameter-tuning python pytorch scikit-learn xgboost

Last synced: 01 Aug 2024

https://github.com/vi3k6i5/GuidedLDA

semi supervised guided topic model with custom guidedLDA

data-science guided-topic-modeling guidedlda machine-learning seededlda topic-modeling

Last synced: 02 Aug 2024

https://github.com/openhackathons-org/gpubootcamp

This repository consists for gpu bootcamp material for HPC and AI

ai4hpc cuda data-science deep-learning deepstream gpu hpc machine-learning mpi openacc openmp rapidsai

Last synced: 31 Jul 2024

https://github.com/insitro/redun

Yet another redundant workflow engine

aws bioinformatics data-engineering data-science docker etl gcp ml python workflow-engine

Last synced: 01 Aug 2024

https://github.com/polyaxon/traceml

Engine for ML/Data tracking, visualization, explainability, drift detection, and dashboards for Polyaxon.

dask data-exploration data-profiling data-quality data-quality-checks data-science data-visualization dataframes dataops explainable-ai matplotlib mlops pandas pandas-summary plotly pytorch spark statistics tensorflow tracking

Last synced: 01 Aug 2024

https://github.com/ing-bank/popmon

Monitor the stability of a Pandas or Spark dataframe ⚙︎

covariate-shift data-analysis data-distributions data-profiling data-science dataset-shifts drift-detection hacktoberfest ing-bank ipython jupyter mlops monitoring pandas population-monitoring python spark statistical-process-control statistical-tests statistics

Last synced: 03 Aug 2024

https://github.com/jmschrei/apricot

apricot implements submodular optimization for the purpose of selecting subsets of massive data sets to train machine learning models quickly. See the documentation page: https://apricot-select.readthedocs.io/en/latest/index.html

data-science machine-learning python submodular-optimization submodularity

Last synced: 01 Aug 2024

https://github.com/hamelsmu/code_search

Code For Medium Article: "How To Create Natural Language Semantic Search for Arbitrary Objects With Deep Learning"

code-search data-science deep-learning fastai keras machine-learning machine-learning-on-source-code ml-on-code natural-language-processing nlp python pytorch search search-algorithm searching-algorithms semantic-search semantic-search-engine tensorflow tutorial

Last synced: 17 Aug 2024

https://github.com/akanz1/klib

Easy to use Python library of customized functions for cleaning and analyzing data.

data-analysis data-cleaning data-preprocessing data-science data-visualization feature-selection klib python

Last synced: 03 Aug 2024

https://github.com/ottogroup/palladium

Framework for setting up predictive analytics services

data-science machine-learning scikit-learn

Last synced: 31 Jul 2024

https://github.com/JuliaAcademy/DataScience

Data Science in Julia course for JuliaAcademy.com, taught by Huda Nassar

data-science julia juliaacademy learnjulia

Last synced: 31 Jul 2024

https://github.com/h2oai/mli-resources

H2O.ai Machine Learning Interpretability Resources

accountability data-mining data-science explainable-ml fairness fatml h2o iml interpretability interpretable-ai interpretable-machine-learning interpretable-ml jupyter-notebooks machine-learning machine-learning-interpretability mli python transparency xai xgboost

Last synced: 02 Aug 2024

https://github.com/InfuseAI/piperider

Code review for data in dbt

code-review continuous-integration data-exploration data-observability data-pipeline data-profiler data-profiling data-quality data-reliability data-science data-testing data-visualization dbt dbt-metrics eda exploratory-data-analysis pull-requests python reporting

Last synced: 01 Aug 2024

https://github.com/explosion/prodigy-recipes

🍳 Recipes for the Prodigy, our fully scriptable annotation tool

active-learning annotation annotation-tool artificial-intelligence computer-vision data-annotation data-science labeling-tool machine-learning machine-teaching natural-language-processing nlp prodigy spacy

Last synced: 02 Aug 2024

https://github.com/janpfeifer/gonb

GoNB, a Go Notebook Kernel for Jupyter

data-science go golang gonb jupyter jupyter-notebook jupyter-notebook-kernel

Last synced: 01 Aug 2024

https://github.com/a16z/nft-analyst-starter-pack

analytics data-science ethereum nfts python

Last synced: 03 Aug 2024

https://github.com/DoubleML/doubleml-for-py

DoubleML - Double Machine Learning in Python

causal-inference data-science double-machine-learning econometrics machine-learning python scikit-learn statistics

Last synced: 24 Aug 2024

https://github.com/rudeboybert/fivethirtyeight

R package of data and code behind the stories and interactives at FiveThirtyEight

cran data-science datajournalism fivethirtyeight r rpackage statistics

Last synced: 07 Aug 2024

https://github.com/FilippoBovo/production-data-science

Production Data Science: a workflow for collaborative data science aimed at production

collaborative data-science production workflow

Last synced: 02 Aug 2024

https://github.com/serengil/chefboost

A Lightweight Decision Tree Framework supporting regular algorithms: ID3, C4.5, CART, CHAID and Regression Trees; some advanced techniques: Gradient Boosting, Random Forest and Adaboost w/categorical features support for Python

adaboost c45-trees cart categorical-features data-mining data-science decision-trees gbdt gbm gbrt gradient-boosting gradient-boosting-machine gradient-boosting-machines id3 kaggle machine-learning python random-forest regression-tree

Last synced: 02 Aug 2024

https://github.com/JuliaDataScience/JuliaDataScience

Book on Julia for Data Science

book data data-manipulation data-science data-visualization julia julia-language

Last synced: 08 Aug 2024

https://github.com/ploomber/sklearn-evaluation

Machine learning model evaluation made easy: plots, tables, HTML reports, experiment tracking and Jupyter notebook analysis.

data-science deep-learning jupyter-notebook machine-learning pytorch scikit-learn sklearn tensorflow

Last synced: 01 Aug 2024

https://github.com/akfamily/aktools

AKTools is an elegant and simple HTTP API library for AKShare, built for AKSharers!

akshare asyncio data data-science fastapi openapi pydanti

Last synced: 31 Jul 2024

https://github.com/pykale/pykale

Knowledge-Aware machine LEarning (KALE): accessible machine learning from multiple sources for interdisciplinary research, part of the 🔥PyTorch ecosystem. ⭐ Star to support our work!

computer-vision data-science deep-learning domain-adaptation graph-analysis knowledge-aware-learning machine-learning medical-image-analysis meta-learning multimodal multimodal-learning python pytorch transfer-learning

Last synced: 01 Aug 2024

https://github.com/tlkh/ai-lab

All-in-one AI container for rapid prototyping

cuda data-science deep-learning docker jupyter nvidia pytorch tensorflow

Last synced: 02 Aug 2024

https://github.com/bodywork-ml/bodywork-core

ML pipeline orchestration and model deployments on Kubernetes.

batch cicd continuous-deployment data-science devops framework kubernetes machine-learning mlops orchestration pipeline python serving

Last synced: 02 Aug 2024

https://github.com/kevintpeng/Learn-Something-Every-Day

📝 A compilation of everything that I learn; Computer Science, Software Development, Engineering, Math, and Coding in General. Read the rendered results here ->

algorithm aws blog computer-science course-materials data-engineering data-science education educational engineering learning math mathematics research software-engineering university unix waterloo

Last synced: 31 Jul 2024

https://github.com/plotly/dash-table

OBSOLETE: now part of https://github.com/plotly/dash

dash data-science data-visualization plotly plotly-dash python react table

Last synced: 01 Aug 2024

https://github.com/breck7/scroll

Scroll is a language for scientists of all ages. Scroll includes a command line app that builds static blogs, websites, CSVs, text files, and more.

blog cms csv data-science knowledge-base knowledge-graph markdown markup markup-language note-taking scroll static-site-generator tree-notation

Last synced: 01 Aug 2024

https://github.com/pgalko/BambooAI

A lightweight library that leverages Language Models (LLMs) to enable natural language interactions, allowing you to source and converse with data.

ai ai-agents data-analysis data-science gemini groq llm mistral ollama openai-api pandas pinecone python vector-database

Last synced: 31 Jul 2024

https://github.com/HHammond/PrettyPandas

A Pandas Styler class for making beautiful tables

data-analysis data-science pandas pandas-dataframe pandas-dataframes pandas-styler python reporting

Last synced: 02 Aug 2024

https://github.com/moabukar/Everything-Tech

A collection of online resources to help you on your Tech journey.

ansible aws azure backend data-engineering data-science devops docker frontend gcp kubernetes machine-learning networking python serverless software-engineering tech terraform

Last synced: 01 Aug 2024

https://github.com/girder/girder

A data management platform for the web, developed by Kitware

data-analytics data-management data-science javascript kitware python resonant

Last synced: 01 Aug 2024

https://github.com/jobream/List-of-Learning-Resources

This collection provides a list of educational resources for Software Engineers. Feel free to add your favorite resources as well and help others in their journey of learning.

competitive-programming computer-science data-science resources software-engineering web-development

Last synced: 02 Aug 2024

https://github.com/run-ai/genv

GPU environment and cluster management with LLM support

bash container-runtime containers data-science deep-learning docker gpu gpus jupyter-notebook jupyterlab-extension k8s kubernetes llm-inference llms nvidia-gpu ollama ray vscode vscode-extension zsh

Last synced: 01 Aug 2024

https://github.com/firmai/pandasvault

Advanced Pandas Vault — Utilities, Functions and Snippets (by @firmai).

data-science data-structures dataframe functions pandas python snippets table tips

Last synced: 03 Aug 2024

https://github.com/okfn-brasil/rosie

🤖 Python application responsible for Serenata de Amor's intelligence

artificial-intelligence data-science machine-learning

Last synced: 31 Jul 2024

https://github.com/ClimbsRocks/machineJS

[UNMAINTAINED] Automated machine learning- just give it a data file! Check out the production-ready version of this project at ClimbsRocks/auto_ml

auto-ml automated-machine-learning automl data-science data-scientists javascript javascript-library kaggle machine-learning machine-learning-algorithms machine-learning-library ml numerai scikit-learn

Last synced: 07 Aug 2024

https://github.com/vmware/versatile-data-kit

One framework to develop, deploy and operate data workflows with Python and SQL.

analytics data data-engineer data-engineering data-engineering-pipeline data-lineage data-pipelines data-science data-structures data-warehouse database dataops elt etl pipeline python snowflake sql trino warehouse

Last synced: 03 Aug 2024

https://github.com/rebecca-vickery/data-science-learning-resources

A comprehensive list of free resources for learning data science

artificial-intelligence data data-science machine-learning python

Last synced: 02 Aug 2024

https://github.com/DataScienceUB/introduction-datascience-python-book

Introduction to Data Science: A Python Approach to Concepts, Techniques and Applications

analytics data data-science datascience machine-learning python sentiment-analysis

Last synced: 07 Aug 2024

https://github.com/ankonzoid/artificio

Deep Learning Computer Vision Algorithms for Real-World Use

ai applications artificial-intelligence auto-encoders computer-vision convolutional-neural-networks data-science deep-learning image-classification image-finder image-processing image-recognition image-retrieval machine-learning neural-networks object-recognition python recommender-system recommender-systems transfer-learning

Last synced: 03 Aug 2024

https://github.com/Chicago/food-inspections-evaluation

This repository contains the code to generate predictions of critical violations at food establishments in Chicago. It also contains the results of an evaluation of the effectiveness of those predictions.

cdph chicago data-science food-poisoning open-data open-science public-health

Last synced: 31 Jul 2024

https://github.com/dcai-course/dcai-lab

Lab assignments for Introduction to Data-Centric AI, MIT IAP 2024 👩🏽‍💻

course data-centric-ai data-science deep-learning homework lab machine-learning

Last synced: 31 Jul 2024

https://github.com/SforAiDl/genrl

A PyTorch reinforcement learning library for generalizable and reproducible algorithm implementations with an aim to improve accessibility in RL

algorithm-implementations benchmarking data-science deep-learning gym hacktoberfest machine-learning neural-network openai python pytorch reinforcement-learning reinforcement-learning-algorithms

Last synced: 02 Aug 2024

https://github.com/5agado/data-science-learning

Repository of code and resources related to different data science and machine learning topics. For learning, practice and teaching purposes.

data-science deep-learning jupyter-notebook learning-by-doing machine-learning statistics

Last synced: 01 Aug 2024

https://github.com/platonai/PulsarRPA

Automate webpages at scale, scrape web data completely and accurately with high performance, distributed RPA.

crawler data-mining data-science rpa scraper scraping web-automation web-crawler web-mining web-scraping web-sql

Last synced: 01 Aug 2024

https://github.com/rio-labs/rio

WebApps in pure Python. No JavaScript, HTML and CSS needed

data-analysis data-science data-visualization deep-learning machine-learning python ui webapp

Last synced: 01 Aug 2024

https://github.com/ledell/useR-machine-learning-tutorial

useR! 2016 Tutorial: Machine Learning Algorithmic Deep Dive http://user2016.org/tutorials/10.html

data-science deep-learning ensemble-learning gradient-boosting-machine machine-learning r random-forest tutorial

Last synced: 07 Aug 2024

https://github.com/capitalone/datacompy

Pandas and Spark DataFrame comparison for humans and more!

compare dask data data-science dataframes fugue numpy pandas polars pyspark python spark

Last synced: 04 Aug 2024

https://github.com/lijqhs/deeplearning-notes

Notes for Deep Learning Specialization Courses led by Andrew Ng.

algorithms andrew-ng backpropagation bias-variance cnn coursera data-analysis data-science deep-learning deeplearning hyperparameter-optimization machine-learning neural-network notes overfitting sequence-models statistics summary tensorflow

Last synced: 01 Aug 2024

https://github.com/airalcorn2/Michael-s-Data-Science-Curriculum

This is the companion curriculum to my guide to becoming a data scientist.

curriculum data-science machine-learning statistics

Last synced: 05 Aug 2024

https://github.com/EpistasisLab/scikit-rebate

A scikit-learn-compatible Python implementation of ReBATE, a suite of Relief-based feature selection algorithms for Machine Learning.

data-science feature-selection python

Last synced: 31 Jul 2024

https://github.com/DaoSword/Time-Series-Forecasting-and-Deep-Learning

Resources about time series forecasting and deep learning.

data-science deep-learning forecasting machine-learning series-data series-forecasting time-series time-series-forecasting

Last synced: 31 Jul 2024

https://github.com/adnanwahab/Simple-GPU

🦒 Functional WebGPU

bioinformatics data-science geospatial javascript regl robotics webgpu

Last synced: 03 Aug 2024

https://github.com/airbnb/artificial-adversary

🗣️ Tool to generate adversarial text examples and test machine learning models against them

adversarial-examples black-box-attacks black-box-benchmarking classification data-mining data-science machine-learning metrics python python2 python3 spam spam-classification spam-detection spam-filtering text text-analysis text-classification text-mining text-processing

Last synced: 02 Aug 2024

https://github.com/kunalj101/Data-Science-Hacks

Data Science Hacks consists of tips, tricks to help you become a better data scientist. Data science hacks are for all - beginner to advanced. Data science hacks consist of python, jupyter notebook, pandas hacks and so on.

computer-vision data data-analysis data-science data-visualization dataset hacks image-augmentation ipynb machine-learning nlp nlp-machine-learning numpy pandas pandas-dataframe pandas-python pandas-tutorial python python3 tips-and-tricks