Samuel Chan Courses

LangChain and OpenAI for Querying Databases and CSV Files with Natural Language

Use LangChain and GPT to turn English questions about a database or CSV into SQL or pandas commands, then return answers in natural language.

• YouTube
• 20 minutes
• Self-Paced
• Free Video

LangChain and OpenAI Tutorial - Building a Q&A System with Custom Text Data

Build a question-and-answer agent with LangChain and OpenAI that answers questions using your own text data.

• YouTube
• 20 minutes
• Self-Paced
• Free Video

TorchVision Quick Start - Building an Image Classifier in 10 Minutes

Build a quick image classifier for orangutans and Komodo dragons using a pretrained ResNet with torchvision.

• YouTube
• 17 minutes
• Self-Paced
• Free Video

Python's Cache and LRU Cache Decorators - Optimizing Computations

See how Python’s `@cache` and `lru_cache` decorators reuse results to avoid repeated computations, with examples and performance comparisons.

• YouTube
• 18 minutes
• Self-Paced
• Free Video

Use Less For-Loops, Use More Vectorization - Improving Code Efficiency

Refactor numerical Python code with NumPy vectorization to replace familiar loops with faster, more concise operations.

• YouTube
• 19 minutes
• Self-Paced
• Free Video

PyTorch's Computational Graph and Torchviz Visualization Tutorial

Build a Fashion-MNIST neural network in PyTorch, then use Torchviz to inspect its computational graph and gradient flow.

• YouTube
• 24 minutes
• Self-Paced
• Free Video

Practical Introduction to Python's Subprocess Module for Developer Workflow Automation

Build a Python command-line tool that sets up a project and starts a todo task in one command.

• YouTube
• 53 minutes
• Self-Paced
• Free Video

Steganography Explanation and Code Examples - Least Significant Bit Replacement

See how least significant bit replacement hides and retrieves messages in digital images through a Python demonstration.

• YouTube
• 24 minutes
• Self-Paced
• Free Video

Making a CV with R and RStudio: Professional and Semantic

Build a professional CV in RStudio using vitae templates and R Markdown knitting features.

• YouTube
• 34 minutes
• Self-Paced
• Free Video

Python Unit Testing and Package Submission - Build with Python 5

Practice Python unit testing on a package, including mocking print output before publishing an updated release.

• YouTube
• 1 hour 2 minutes
• Self-Paced
• Free Video

Creating Rolling Sum Grouped by ISO Weeks Using Python - No Pandas Required

Create a weekly rolling sum grouped by ISO weeks using Python’s standard library, with itertools.groupby and a simple loop.

• YouTube
• 29 minutes
• Self-Paced
• Free Video

Python Code Refactoring - Writing Modular Functions

Learn to break a monolithic Python function into smaller, testable functions through a practical refactoring of a Python package.

• YouTube
• 26 minutes
• Self-Paced
• Free Video

Smart Contract Programming - Deploying to Rinkeby Testnet and Validating on Etherscan - Part 7

Move a Brownie smart contract from a local blockchain to Rinkeby, then verify it on Etherscan so wallets can interact with it.

• YouTube
• 54 minutes
• Self-Paced
• Free Video

Building and Publishing a Python Package - How to Distribute on PyPI

Package a Python command-line productivity tool, build wheel and source distributions, and publish it on PyPI.

• YouTube
• 18 minutes
• Self-Paced
• Free Video

Smart Contract Programming - Writing Unit Tests with Brownie and Pytest - Part 6

Write Python-based unit tests with Brownie and pytest to check the main functions of an Ethereum ballot smart contract.

• YouTube
• 43 minutes
• Self-Paced
• Free Video