Not all PDFs are created equal. A "better" version of Neural Networks and Deep Learning typically includes:
Unlike video tutorials (which force a passive viewing pace) or dense academic papers (which assume too much), Nielsen’s PDF hits the "Goldilocks Zone." It is rigorous enough for a university student but conversational enough for a curious software developer. Not all PDFs are created equal
Suggested reading path (concise)
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http://neuralnetworksanddeeplearning.com Not all PDFs are created equal