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Table Of Contents
Deep Learning with C++
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In this chapter, you built up—from first principles—the machinery to train small neural networks in C++. You started with linear and logistic regression to ground the math of loss functions and gradients, then framed a neuron as an affine transform plus a nonlinearity. You implemented a tiny MLP with Eigen, wrote the forward pass (
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), and derived the backward pass with the chain rule to obtain layer-wise deltas and outer-product gradients. You trained the model with gradient descent variants (batch, stochastic, mini-batch), monitored accuracy/MSE on a held-out split, and learned practical habits: shuffling each epoch, choosing output activations and losses that match the task, and interpreting learning rate as the step size. Along the way, you saw that once data is mapped to vectors, the same forward | backward | update loop works across domains. This sets you up to scale the exact logic to LibTorch and, later, to GPU acceleration with CUDA.
In the next...