Your laptop has a CPU. A CPU runs code one operation at a time, very fast. For Python scripts, data processing, and small models, it is completely fine. Training a neural network is different. A single training step involves millions of matrix multiplications. A CPU does these sequentially. Even a decent laptop CPU takes minutes per epoch on a small image dataset. A real training run can take hours. Or days. A GPU does those same matrix multiplications in parallel. Thousands of cores, all working simultaneously. What took 4 hours on a CPU takes 8 minutes on a GPU. You probably do not own a GPU. Google does, and they will let you use one for free. That is Google Colab. What Colab Is Google Colab is Jupyter Notebooks running in the cloud on Google's infrastructure. Open your browser. Go to colab.research.google.com. Start coding. No installation. No setup. Python is already there. The most common data science libraries are already installed. And you can switch on a free GPU with two clicks.…