1 pts Suppose that we train a neural network to classify images. The inputs are 5-by-5 grayscale images (Le. there are 25 pixels in each image), and the labels contain 10 classes. Connected with the input layer (with the image as a flattened 1-dimensional vector), there are 5 nodes in the first hidden layer, 4 in the second hidden layer, and then followed with the softmax output layer. Each node is given an activation function of ReLU). How many trainable parameters are there in this neural network?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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### Neural Networks and Image Classification

#### Problem Statement
Suppose that we train a neural network to classify images. The inputs are 5-by-5 grayscale images (i.e., there are 25 pixels in each image), and the labels contain 10 classes. Connected with the input layer (with the image as a flattened 1-dimensional vector), there are 5 nodes in the first hidden layer, 4 in the second hidden layer, and then followed with the softmax output layer. Each node is given an activation function of ReLU(x). How many trainable parameters are there in this neural network? 

#### Explanation and Calculations
- **Input Layer**: 25 pixels (flattened)
- **First Hidden Layer**: 5 nodes
- **Second Hidden Layer**: 4 nodes
- **Output Layer**: 10 classes (nodes)

To compute the number of trainable parameters, we need to calculate weights and biases between each layer:

1. **Between Input and First Hidden Layer**:
   - Weights: 25 (input nodes) * 5 (hidden nodes) = 125
   - Biases: 5
   - Total: 125 + 5 = 130

2. **Between First Hidden and Second Hidden Layer**:
   - Weights: 5 * 4 = 20
   - Biases: 4
   - Total: 20 + 4 = 24

3. **Between Second Hidden and Output Layer**:
   - Weights: 4 * 10 = 40
   - Biases: 10
   - Total: 40 + 10 = 50

**Total Trainable Parameters**:
130 (first connection) + 24 (second connection) + 50 (third connection) = 204

Therefore, there are **204 trainable parameters** in this neural network.
Transcribed Image Text:### Neural Networks and Image Classification #### Problem Statement Suppose that we train a neural network to classify images. The inputs are 5-by-5 grayscale images (i.e., there are 25 pixels in each image), and the labels contain 10 classes. Connected with the input layer (with the image as a flattened 1-dimensional vector), there are 5 nodes in the first hidden layer, 4 in the second hidden layer, and then followed with the softmax output layer. Each node is given an activation function of ReLU(x). How many trainable parameters are there in this neural network? #### Explanation and Calculations - **Input Layer**: 25 pixels (flattened) - **First Hidden Layer**: 5 nodes - **Second Hidden Layer**: 4 nodes - **Output Layer**: 10 classes (nodes) To compute the number of trainable parameters, we need to calculate weights and biases between each layer: 1. **Between Input and First Hidden Layer**: - Weights: 25 (input nodes) * 5 (hidden nodes) = 125 - Biases: 5 - Total: 125 + 5 = 130 2. **Between First Hidden and Second Hidden Layer**: - Weights: 5 * 4 = 20 - Biases: 4 - Total: 20 + 4 = 24 3. **Between Second Hidden and Output Layer**: - Weights: 4 * 10 = 40 - Biases: 10 - Total: 40 + 10 = 50 **Total Trainable Parameters**: 130 (first connection) + 24 (second connection) + 50 (third connection) = 204 Therefore, there are **204 trainable parameters** in this neural network.
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