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Bách Hoá Tuyết Ánh
Bách Hoá Tuyết Ánh
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Saturday 19 September 2026 13:31:15 GMT
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Backpropagation is the algorithm that tells a neural network how each weight and bias contributed to its mistakes. 🧠 Here is exactly how it works: 1️⃣ Make a Prediction: The network processes the inputs using its current weights and biases. 2️⃣ Calculate Loss: A loss function measures how far the prediction is from the correct answer. 3️⃣ Propagate the Error: Starting from the output layer, the error flows backward through the network, computing how much each weight and bias contributed to the loss. 4️⃣ Compute the Gradient: This produces one derivative for every parameter, showing which direction reduces the loss the fastest. 5️⃣ Update the Parameters: Gradient descent nudges every weight and bias a small step in the direction that reduces the loss. 6️⃣ Repeat: The network repeats steps 1 through 5 over and over until its predictions become increasingly accurate. 📈 A few key things to know: ✅ Backpropagation computes the gradients—it does not update the weights itself. ✅ Gradient descent uses those gradients to actually update the weights and biases. ✅ The chain rule makes it possible to efficiently compute gradients for every parameter, even in very deep neural networks. Why it matters: ⚠️ Without backpropagation, modern neural networks wouldn't be able to learn from data. ⚠️ It makes training networks with thousands—or even millions—of parameters computationally feasible. #NeuralNetworks #Backpropagation #DeepLearning #AIEducation #MachineLearning
Backpropagation is the algorithm that tells a neural network how each weight and bias contributed to its mistakes. 🧠 Here is exactly how it works: 1️⃣ Make a Prediction: The network processes the inputs using its current weights and biases. 2️⃣ Calculate Loss: A loss function measures how far the prediction is from the correct answer. 3️⃣ Propagate the Error: Starting from the output layer, the error flows backward through the network, computing how much each weight and bias contributed to the loss. 4️⃣ Compute the Gradient: This produces one derivative for every parameter, showing which direction reduces the loss the fastest. 5️⃣ Update the Parameters: Gradient descent nudges every weight and bias a small step in the direction that reduces the loss. 6️⃣ Repeat: The network repeats steps 1 through 5 over and over until its predictions become increasingly accurate. 📈 A few key things to know: ✅ Backpropagation computes the gradients—it does not update the weights itself. ✅ Gradient descent uses those gradients to actually update the weights and biases. ✅ The chain rule makes it possible to efficiently compute gradients for every parameter, even in very deep neural networks. Why it matters: ⚠️ Without backpropagation, modern neural networks wouldn't be able to learn from data. ⚠️ It makes training networks with thousands—or even millions—of parameters computationally feasible. #NeuralNetworks #Backpropagation #DeepLearning #AIEducation #MachineLearning

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