NumPy | Ecosyste.ms: Awesome

https://github.com/UoAACG/WorkshopNotebooks

Repository of the Scientific Python Worshop at UOA

astronomy astrophysics astropy numpy python scientific-computing scipy sympy workshop

Last synced: 22 Jul 2025

https://github.com/axect/scientific_bench

Benchmark some scientific computations for various languages & libraries

benchmark cpp eigen3 julia languages nim numpy python rust scientific-computing

Last synced: 13 Apr 2025

https://github.com/umr-lops/kpi_mpc

library to compute the MPC Sentinel-1 KPI

netcdf numpy python xarray

Last synced: 30 Jan 2026

https://github.com/juzershakir/creating-customer-segments

Applied Unsupervised Learning techniques on product spending data collected for customers of a wholesale distributor to identify customer segments hidden in the data.

classification customer-segments data-exploration data-visualization feature-selection gaussian-mixture-models k-means-clustering machine-learning-nanodegree machine-learning-tutorials matplotlib numpy pandas pca python scikit-learn seaborn silhouette udacity unsupervised-learning unsupervised-machine-learning

Last synced: 22 Oct 2025

https://github.com/machphy/python_programming_

.py

filehandling function list modules multithreading numpy oops-in-python os python-data-analysis thinker tuples

Last synced: 09 Apr 2025

https://github.com/fandreuz/parallel-mapped-distance-matrix

Parallel mapped distance matrix with NumPy and Numba

hacktoberfest hpc numba numpy

Last synced: 22 Feb 2026

https://github.com/jsdhami/python-for-research

"Python-For-Research" Event Organized By Tri-Chandra Research Group, Ghantaghar, Kathmandu

analysis colab data jupyter matplotlib numpy panda physics python research visualization

Last synced: 27 Oct 2025

https://github.com/kaslanarian/fastconv

卷积操作(1d, 2d)的快速实现

convolution convolutional-neural-networks numpy

Last synced: 12 Mar 2025

https://github.com/borjaest/gevopy

Genetics for Evolutionary Algorithms in Python

evolutionary-algorithms genetic-algorithm hyperparameter-optimization numpy

Last synced: 06 Mar 2026

https://github.com/tambeta/juice

Terrain generator + a simple top-down scrolling engine skeleton

numpy opengl pyglet python python3 scipy terrain terrain-generation top-down

Last synced: 09 Apr 2026

https://github.com/bratergit/lastchancehackertoberfest

In the final hours of hacktoberfest 2024 your last chance to get a tee

hacktoberfest hacktoberfest-accepted hacktoberfest2024 numpy pandas python3 streamlit

Last synced: 11 Apr 2025

https://github.com/ranjan2104/face-unlock-and-lock-recogination-system

When using face recognition to unlock your device, your phone could be unlocked by someone or something that looks like your image. The possibility of the exceptional cases where the current detector can mistake fake image as a live input, the decision logic was already applied to strengthen the anti-spoofing function.

isfile join lbph-face-recognizer listdir numpy opencv python3

Last synced: 02 May 2026

https://github.com/rudra00434/codenova.devs

CodeNova an Ultimate Gen AI project with multiple features that helps developers to get their job ready and also ensure their to help in production level

generative-ai groq-api json-web-token langchain langchain-agent llama3 matplotlib-pyplot numpy postman-test pyhton3 regex-match rest-api-test

Last synced: 05 May 2026

https://github.com/rajshah1/datastructurealgo-6140

Comparison Based Sorting Algorithms | ITCS 6114 | Course Project

numpy python random-number-generators sorting-algorithms

Last synced: 20 Apr 2026

https://github.com/yashika-malhotra/data-exploration-and-visualization-for-streaming-platform

Data Analysis and Visualization for streaming platform to provide insights and recommendations to improve their userbase.

colab-notebook data data-visualization jupyter-notebook matplotlib numpy pandas python seaborn

Last synced: 18 Apr 2026

https://github.com/docsallover/movie-recommendation

Content-Based Movie Recommendation System In Python Using Numpy, Scikit-Learn & Pandas

data-science jupyter machine-learning numpy pandas python scikit-learn

Last synced: 08 Apr 2026

https://github.com/r13i/painting-with-neural-net

Project to train a neural network to paint using TensorFlow.

jupyter-notebook machine-learning neural-networks numpy python tensorflow

Last synced: 11 Apr 2026

https://github.com/ivorforce/python-arrayclass

A python class decorator similar to dataclass that uses a contiguous numpy array to store values.

dataclass numpy python

Last synced: 13 Apr 2025

https://github.com/u-na-gi/rust-python-pyo3-integration-samples

A sample project demonstrating Rust and Python integration using PyO3, showcasing how to call Python functions from Rust. This project uses Docker for easy environment setup and test execution.

docker ffi integration numpy pyo3 python rust

Last synced: 23 Jan 2026

https://github.com/udityamerit/python-librearies-for-data-science

Python libraries for data science enable efficient data manipulation, analysis, and modeling. Key libraries include NumPy for numerical computing, pandas for data handling, Matplotlib for visualization, Scikit-learn for machine learning, TensorFlow for deep learning, and BeautifulSoup/requests for web scraping. These libraries simplify complex data

beautifulsoup data data-science data-science-libraries machine-learning matplotlib numpy pandas requests scikit-learn scikitlearn-machine-learning tensorflow

Last synced: 06 Feb 2026

https://github.com/fobersteiner/pyfuppes

A collection of Python tools

data-processing numpy pandas python python-polars

Last synced: 12 Apr 2025

https://github.com/parimala24-ds/data-science-interview-practice23

DATA-SCIENCE-INTERVIEW-PRACTCE-CODE2023

2024 dataanlytics datascience interview-practice interview-questions numpy pandas python python3 pythonbasics pythonbeginner pythondeveloper pythonprograms

Last synced: 13 Jun 2025

https://github.com/matx64/rs-cvbot

Old School Runescape (MMORPG) Bot created using OpenCV (template matching) for object identification

numpy opencv python

Last synced: 10 Apr 2026

https://github.com/hameerabbasi/sparse-ndarray-protocols

Proposed protocols for sparse ndarray implementations in Python/SciPy

numpy python scipy sparse-matrix

Last synced: 04 Feb 2026

https://github.com/dhrupad17/python-for-data-science-a-z

This is a practice Repository consisting of all the notebooks I have practiced to learn python for data science from basics to Advance.

flask matplotlib-python numpy pandas-python python python-lambda seaborn-python streamlit

Last synced: 23 Jan 2026

https://github.com/hexdecimal/raywizard

A game submitted to the 2021 7DRL. You play as a wizard with magical abilities which can alter the terrain around you.

7drl 7drl2021 itchio libtcod numpy python-3 python-tcod roguelike-game

Last synced: 11 Sep 2025

https://github.com/robocorp/example-x-ray-image-processing

X-ray Image Viewer (NumPy, imageio, Matplotlib, SciPy)

data-science numpy python robotframework xray-images

Last synced: 21 Oct 2025

https://github.com/ruferdz/face-detector

😁 An implementation of Face Detection and Face Recognition using Python OpenCV

face-detection face-recognition numpy opencv-python pillow

Last synced: 19 May 2026

https://github.com/jintao-huang/leetcode-cpp

jintao的cpp库: leetcode, mini_stl, ml.

algorithm cpp cpp17 data-structure leetcode machine-learning mini-stl numpy stl

Last synced: 17 May 2026

https://github.com/vidhi1290/lung-cancer-detection-app

🔍 Discover the future of healthcare with our Lung Cancer Detection Project. Using advanced machine learning techniques, we've achieved 92% accuracy in identifying lung cancer. Join us at the forefront of medical AI. 👩‍⚕️🌟 #AIHealthcare #LungCancerDetection

artificial-intelligence cancer-detection datascience datascience-machinelearning kaggle lungcancer machine-learning machine-learning-algorithms numpy pandas python randomforest

Last synced: 08 May 2026

https://github.com/sumitgirwal/google-play-store-data-analysis

This Google Play Store dataset from Kaggle, analysis using Python, NumPy , Pandas , and Matplotlib.In dataset analysis, you can view the best app 5-star rating app, most review app, or most download app, etc.

dataanalysis matplotlib numpy pandas playstore-data-analysis python3

Last synced: 08 May 2025

https://github.com/hunar4321/multiple-regression

A simple intuitive method for multiple regression

linear-regression machine-learning multiple-regression numpy predictive-modeling python regression

Last synced: 01 May 2026

https://github.com/chathumiamarasinghe/spam-mail-prediction-using-ml

A Python-based machine learning project to classify emails as spam or not spam. This system uses algorithms like Naive Bayes or Logistic Regression to detect spam with high accuracy, providing a reliable solution for email filtering.

data-science ipynb jupiter-notebook matplotlib numpy pandas python scikit-learn spammailprediction

Last synced: 30 Oct 2025

https://github.com/moindalvs/assignment_hypothesis_test

A F&B manager wants to determine whether there is any significant difference in the diameter of the cutlet between two units. A randomly selected sample of cutlets was collected from both units and measured? Analyze the data and draw inferences at 5% significance level. Please state the assumptions and tests that you carried out to check validity of the assumptions.

2sample-2tail anova-test chisquare chisquare-test contingency-table hypothesis hypothesis-testing numpy numpy-arrays pandas scipy-stats testofindependence

Last synced: 20 Oct 2025

https://github.com/3rd-son/car-mileage-model

EDA and Model that predicts the mpg of cars

eda jupyter-notebook linear-regression machine-learning matplotlib numpy pandas python seaborn sklearn

Last synced: 10 Apr 2026

https://github.com/vishnu-t-r/mini_projects_data_analysis_python

In this repository you will find python scripts that were wrote as part of learning and refreshing activity. This repository has been created for future references.

bar-chart dataframe matplotlib numpy pandas pandas-dataframe series time-series

Last synced: 17 Feb 2026

https://github.com/mayankbohra/data-science-project

The objective of this report is to examine and analyze the recent growth of industries by considering various factors

data-science data-visualization matplotlib numpy pandas python

Last synced: 19 Jul 2025

https://github.com/saahen-sriyan-mishra/machine-learning-python

This Repo. contains all my Python based Machine Learning projects using numerous algorithms for the purpose of Classification, Clustering, Recommendation, Prediction and Anomaly Detection.

classification clustering convolutional-neural-networks decision-tree-classifier gradient-boosting knn-classifier logistic-regression lstm-model machine-learning numpy pandas prediction random-forest regression support-vector-machines tinker xgboost

Last synced: 11 May 2026

https://github.com/yonetaniryo/numpy2tfrecord

Simple helper library to convert numpy data to tfrecord and build a tensorflow dataset

numpy tensorflow tfrecord

Last synced: 20 Mar 2025

https://github.com/jn513/image-editor

Pequeno editor de imagens, feito com Python, Pillow e Python OpenCV

numpy opencv-python pillow python3

Last synced: 17 May 2026

https://github.com/AlbertSuarez/which-dog-are-you

🐶 Dog and face person matcher based on image similarity

dog hackathon nmslib numpy python similarity tensorflow

Last synced: 14 Mar 2025

https://github.com/tynab/animal-chess

Animal Chess

a-star a-star-algorithm animal-chess bfs bfs-algorithm board-game breadth-first-search breadth-first-search-algorithm chess chess-game cnn deep-learning game keras numpy pandas scikit-learn search-algorithm sklearn tensorflow

Last synced: 20 Feb 2026

https://github.com/hritik5102/numpy-for-beginners

NumPy is a Python library that is the core library for scientific computing in Python.

numpy numpy-arrays numpy-basic numpy-exercises numpy-for-beginners numpy-trick numpy-tutorial

Last synced: 17 May 2026

https://github.com/rannd1nt/phaethon

End-to-End Physics-Constrained Scientific Computing & Sci-ML Framework

data-science engineering frameworks linear-algebra machine-learning numpy pandas pde physics pinns python python-library python3 scientific-computing scientific-machine-learning scikit-learn sklearn torch type-hints units

Last synced: 11 Apr 2026

https://github.com/bhattbhavesh91/self-attention-python

This repository will guide you to implement a simple self-attention mechanism using the Python's NumPy library

attention-mechanism numpy python self-attention self-attention-implementation

Last synced: 15 Oct 2025

https://github.com/concaption/minimem-vector-store

minimem is a minimal implementation of in-memory vector-store using only numpy

numpy vector-store

Last synced: 11 Jun 2025

https://github.com/lakshay-a/alzheimer-diagnosis-using-cnn

An advanced deep learning tool for Alzheimer's disease diagnosis using a CNN with transfer learning from DenseNet-121 pre-trained on RadImageNet, achieving a test accuracy of 95.13%. It features a user-friendly interface for uploading MRI scans and provides immediate classification into AD, MCI, or CN stages.

kfold-cross-validation matplotlib numpy python3 scikit-learn tensorflow transfer-learning

Last synced: 23 Feb 2026

https://github.com/seanpm2001/learn-numpy

📚️ A repository for showcasing my knowledge of the NumPy programming language, and continuing to learn the language.

gpl3 gplv3 learn-numpy learn-numpy-lang learn-numpy-language numpy numpy-lang numpy-language

Last synced: 14 Oct 2025

https://github.com/itc-water-resources/shxarray

Extension to xarray providing functionality to work with spherical harmonic datasets

geodesy gravimetry numpy satellite xarray

Last synced: 18 Jul 2025

https://github.com/toon-van-berkel/pp-imagetovideofx

ImageToVideoFX is a simple Python project that takes an image (JPG/PNG) and transforms it into a short video with a smooth zoom effect. You can optionally add background music. This is perfect for content creators or developers who want to automate turning images into engaging video content.

imagetovideo moviepy numpy pillow python

Last synced: 25 Apr 2026

https://github.com/prahaladhchandrahasan/facemask_detector

CNN which detects the presence of face mask.

keras mobilenetv2 numpy opencv-python tensorflow tensorflow2

Last synced: 04 May 2026

https://github.com/thedvlprguy/Pycamp

javascript machine machine-learning machine-learning-algorithms numpy numpy-arrays numpy-library numpy-neural-network pandas pandas-dataframe pandas-library pandas-python pandas-tutorial

Last synced: 14 Mar 2025

https://github.com/sumitgirwal/pokemon-dataset-data-analysis

This is a simple analysis of Pokemon dataset from Kaggle using Python , NumPy, Pandas, and Matplotlib.

dataanalysis kaggledatasets matplotlib numpy pandas-python pokemon-dataset python3

Last synced: 04 Apr 2026

https://github.com/intelpython/optimizations_bench

Collection of performance benchmarks used to present optimizations implemented for Intel(R) Distribution for Python*

benchmark mkl-umath numpy python

Last synced: 12 Apr 2025

https://github.com/khaymanii/multiple-disease-prediction-system

This system predicts if a patient has heart, parkinsons and diabetes disease

matplotlib numpy pandas python scikit-learn

Last synced: 17 Apr 2026

https://github.com/sweety-vigneshg/chatbot-using-python

This Repository is Created for Third Year IBM Nan Muthalvan Projects Reports, Documentation, Demo Video and Project Source Codes Maintaining.

chatbot chatbot-application chatgpt chatgpt-app matplotlib numpy pandas python python-chatbot pythonchatbot

Last synced: 09 Jul 2025

https://github.com/nicholas-miklaucic/eins

One tensor operation is all you need

array deep-learning einops jax numpy python

Last synced: 05 Feb 2026

https://github.com/shakilgithub20/classifying_textual_emotions

keras loss-functions metrics nlp numpy numpy-arrays optimizer tensorflow

Last synced: 03 Feb 2026

https://github.com/ratulmaharaj/predictable

A framework for actuarial modelling.

actuarial cashflows modelling-framework numpy pandas python

Last synced: 11 Oct 2025

https://github.com/futuresea-dev/pairs-trading-bot

pairs trading bot

colorama matplotlib metatrader5 numpy pandas python pytz sklearn statsmodels

Last synced: 27 Jan 2026

https://github.com/karan-malik/restrictedboltzmannmachine

Python3 implementation of the Unsupervised Deep Learning Algorithm, Restricted Boltzmann Machine.

artificial-intelligence artificial-neural-networks boltzmann-machines deep-learning deep-learning-algorithms deep-neural-networks numpy numpy-neural-network python python3 pytorch pytorch-implementation restricted-boltzmann-machine torch unsupervised-deep-learning unsupervised-learning unsupervised-learning-algorithms unsupervised-machine-learning

Last synced: 10 Apr 2026

https://github.com/luismisanve/mlp-trainer-examples

Three MLP Trainer Examples compiled in a Jupyter Notebook

jupyter-notebook matplotlib mlp numpy python torch

Last synced: 23 Feb 2026

https://github.com/ankit1598/letsupgrade-ai-ml

Assignments for LetsUpgrade AI-ML

algorithms artificial-intelligence data-science machine-learning matplotlib numpy pandas python scipy seaborn sklearn statistics

Last synced: 26 Aug 2025

https://github.com/reactmed/neurdicom-plugins

Neurdicom plugins

dicom mri numpy plugins

Last synced: 24 Feb 2026

https://github.com/aidarkhaibulov/teapot-art

Computer graphics artwork. It's raster graphics teapot which implemented by using Bresenham's algorithm to draw the lines between points.

bresenham-algorithm computergraphics matplotlib numpy

Last synced: 20 May 2026

https://github.com/abhiramdodda/rainfall_prediction

Machine Learning model built on Telangana dataset cropped from Indian weather dataset merged with average temperature dataset

numpy pandas python3 scikit-learn scikitlearn-machine-learning

Last synced: 12 Apr 2026

https://github.com/sandeep-shaw10/py-aes

Implementation of Advance Encryption Standard (AES-128/192/256/512) using Python and Numpy

aes-128 aes-192 aes-256 aes-512 blockcipher cryptography numpy python symmetric-encryption

Last synced: 22 Aug 2025

https://github.com/jparedesds/lazy-classifier-traffic-accidents-madrid

Analysis and predictions of Traffic Accidents in the City of Madrid

datetime hyperopt lazypredict matplotlib numpy pandas pickle requests seaborn sklearn squarify

Last synced: 23 Feb 2026

https://github.com/isatyamks/neural_network

Build, train, and test a neural network entirely from scratch

machine-learning machine-learning-algorithms model neural-network nnfs numpy scratch

Last synced: 17 Aug 2025

https://github.com/azogue/rpi_docker_base

Docker container for RPI3 SaaS development, with Python 3.6.6, Numpy, Pandas and Scipy installed

docker-image numpy pandas python-3-6 scipy

Last synced: 12 Apr 2026

https://github.com/varunbanka/data-insights

Data Insights is a user-friendly tool for analyzing large CSV files. Its advanced analytics helps uncover hidden patterns and trends, making it perfect for data scientists and analysts.

artificial-intelligence automation data-analysis data-science dataanalysis datahive numpy pandas python

Last synced: 22 Jun 2025

https://github.com/rohan-paul/general-kaggle-notebooks

datascience kaggle kaggle-challenge kaggle-competition machinelearning mathematics numpy pandas-python statistics

Last synced: 08 May 2026

https://github.com/billy-enrizky/image_shuffle

A Python utility for shuffling and augmenting image data stored as .npy files. Designed to enhance machine learning datasets by generating randomized variations of image arrays through grid-based shuffling, split operations, and rotations.

data-processing image-processing image-shuffler numpy shuffler

Last synced: 17 Feb 2026

https://github.com/johanmodin/spacecubes

A simple voxel renderer for 3D NumPy arrays

3d easy numpy render voxel

Last synced: 01 Apr 2025

https://github.com/kleinyuan/numpy-ml

Implementations of machine learning concepts in modules with basic numpy

basics machine-learning numpy

Last synced: 16 May 2026

https://github.com/aidarkhaibulov/chaos-cubes-art

Computer graphics artwork. It's raster graphics which simulates Brownian motion.

bresenham-algorithm brownian-motion computergraphics matplotlib numpy

Last synced: 19 May 2026

https://github.com/shaadclt/data-preprocessing-pipeline

This project contains a data preprocessing pipeline implemented in Python using the pandas and numpy libraries. The pipeline handles missing values, outliers, and normalizes numeric features in a dataset.

numpy pandas scikit-learn

Last synced: 18 Apr 2026

https://github.com/utsanjan/traffic-prediction-model

Traffic prediction model built with python using Machine learning and Image processing

anaconda image-processing ipynb jupyter-notebook machine-learning matplotlib numpy pip python python3 tensorflow traffic-prediction

Last synced: 13 Jul 2025

https://github.com/walt-lab/waltlabtoolss

A collection of tools for biomedical research assay analysis in Python.

assay biomedical-data-science calibration-curve concentrations curve-fitting diagnostics elisa modeling numpy python

Last synced: 26 Jun 2025

https://github.com/ruban-edward/ai-virtual-painter

Developed an application that allows us to virtually paint in the air using their fingers. Developed in python using Opencv ,MediaPipe and Numpy

handtrack-library math mediapipe numpy opencv2 os

Last synced: 23 Feb 2026

https://github.com/iamabirakash/python

int375 jupyter jupyter-notebook numpy numpy-arrays numpy-exercises numpy-library python python3

Last synced: 05 Oct 2025

https://github.com/mayukhdeb/gradient-games

mostly contains scratchy numpy code to build and train basic neural networks. You might also find a few experiments on torch.

neural-networks numpy

Last synced: 01 May 2026

https://github.com/coding-enthusiast9857/automatic_text_generation

Welcome to the repository, where innovation meets language! This repository is a comprehensive collection of tools, models, and resources dedicated to the exciting field of automatic text generation. Whether you're a researcher, developer, or enthusiast, this repository provides a playground for exploring cutting-edge technology.

ai ann cnn deep-learning deep-neural-networks gru keras lstm ml neural-networks nlp numpy python rnn tensorflow tensorflow2 text-processing

Last synced: 12 Apr 2026

https://github.com/danielpuentee/outdpik

The fundamental toolkit for outliers search and visualization. It aims to be the fundamental high-level package for this purpose.

data-analysis matplotlib numpy python

Last synced: 16 Aug 2025

https://github.com/shayan925/adhd-aid

A software application that aims on supporting people with ADHD. The aid refocuses the user upon distraction by tracking the user's eyes and prompting them with an audio/visual notification .

data-processing datetime machine-learning mediapipe numpy opencv python3 winsound

Last synced: 01 Apr 2025

https://github.com/zehanort/rvg

A random values generator for any data type in Python 3

numpy numpy-arrays python python-3 python3 random random-generation random-number-generators randomizer types typesafe typesafety

Last synced: 08 Oct 2025

https://github.com/akash-peace/face-recognition

AJ Face Recognizer project objective is to make a face recognizing model from own dataset of two faces.

facenet keras matplotlib mtcnn npz numpy opencv pickle pillow python3 sav scikit-learn

Last synced: 10 Apr 2026

https://github.com/jparedesds/email-mapi-automation

Automation of documentation entry through email(Outlook/IMAP) to excel and BBDD (ERP)

beautifulsoup4 imap-client numpy outlook pandas regex shutil timestamp xlsxwriter

Last synced: 11 Aug 2025

https://github.com/mirsazzathossain/cse317-lab-numerical-methods

This repository includes the lab worksheets and assignments for the Numerical Methods Lab course at Independent University, Bangladesh.

numerical-methods numpy python

Last synced: 19 Jun 2025

https://github.com/dukesmith0/pytherm

Interactive 2D heat conduction simulator. Paint materials onto a grid and watch Fourier's law in action. PyQt6 desktop app with a real-time FDM solver.

desktop-app engineering fdm heat-transfer numpy physics-simulation pyqt6 python simulation thermal

Last synced: 08 Apr 2026

https://github.com/furk4nbulut/veri-bilimi-ve-makine-ogrenmesi

This repository showcases the process and insights I have gained in the fields of data science and machine learning.

data-science keras machine-learning numpy pandas python tensorflow

Last synced: 08 Apr 2026

https://github.com/eve-ning/numpy_as_strided_guide

NumPy as_strided Guide

numpy numpy-tutorial python

Last synced: 02 May 2026

https://github.com/guocuimi/minitf

Simplified version of Tensorflow for learning purposes.

autodiff backpropagation deep-learning gradients neural-networks numpy python tensorflow

Last synced: 23 Feb 2026

https://github.com/jananiarunachalam/Data-Science-Portfolio

Data Science Projects Repository

analytics api data-cleaning data-science data-visualization databases deep-learning excel machine-learning numpy pandas plotly predictive-modeling python3 r r-programming sql

Last synced: 20 Jul 2025

https://github.com/ginberg/boston_housing

Predicting house prices in Boston with python/scikit-learn

jupyter-notebook machine-learning-algorithms numpy predicting-housing-prices python scipy

Last synced: 12 Apr 2026

https://github.com/saurabh-takle/mnist-handwritten-digit-recognition

The MNIST dataset consists of 0-9 digits with black background and white digit. The Handwritten digit recognition successfully identifies all the handwritten digits using sequential model.

classification digit-recognition handwritten-digit-recognition jupyter-notebook mnist-classification mnist-dataset numpy python3 tensorflow