Évaluation d’un modèle à sorties multiples

Dans cet exercice, vous allez vous entraîner à évaluer des modèles à sorties multiples. Votre tâche est d’écrire une fonction appelée evaluate_model() qui prend en entrée un modèle prédisant l’alphabet et le caractère, exécute la boucle d’évaluation et affiche la précision du modèle sur les deux tâches.

Vous pouvez supposer que la fonction aura accès à dataloader_test. Les imports suivants ont déjà été exécutés pour vous :

import torch
from torchmetrics import Accuracy

Une fois evaluate_model() implémentée, vous l’utiliserez dans l’exercice suivant !

Cet exercice fait partie du cours

<cours>Deep learning intermédiaire avec PyTorch</cours>

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Exercice interactif pratique

Essayez cet exercice en complétant ce code d’exemple.

def evaluate_model(model):
    # Define accuracy metrics
    acc_alpha = ____(____, ____)
    acc_char = ____(____, ____)

Modifier et exécuter le code

Cet exercice fait partie du cours

<cours>Deep learning intermédiaire avec PyTorch</cours>

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Learn how to train neural networks in a robust way. In this chapter, you will use object-oriented programming to define PyTorch datasets and models and refresh your knowledge of training and evaluating neural networks. You will also get familiar with different optimizers and, finally, get to grips with various techniques that help mitigate the problems of unstable gradients so ubiquitous in neural nets training.

Exercise 1: PyTorch and object-oriented programming Exercise 2: PyTorch Dataset Exercise 3: PyTorch DataLoader Exercise 4: PyTorch Model Exercise 5: Optimizers, training, and evaluation Exercise 6: Training loop Exercise 7: Optimizers Exercise 8: Model evaluation Exercise 9: Vanishing and exploding gradients Exercise 10: Initialization and activation Exercise 11: Activations: ReLU vs. ELU Exercise 12: Batch Normalization

Train neural networks to solve image classification tasks. In this chapter, you will learn how to handle image data in PyTorch and get to grips with convolutional neural networks (CNNs). You will practice training and evaluating an image classifier while learning about how to improve the model performance with data augmentation.

Exercise 1: Handling images with PyTorch Exercise 2: Image dataset Exercise 3: Data augmentation Exercise 4: Data augmentation in PyTorch Exercise 5: Convolutional Neural Networks Exercise 6: The convolutional layer Exercise 7: Building convolutional networks Exercise 8: Training image classifiers Exercise 9: Choosing augmentations Exercise 10: Dataset with augmentations Exercise 11: Image classifier training loop Exercise 12: Evaluating image classifiers Exercise 13: Multi-class model evaluation Exercise 14: Analyzing metrics per class

Build and train recurrent neural networks (RNNs) for processing sequential data such as time series, text, or audio. You will learn about the two most popular recurrent architectures, Long-Short Term Memory (LSTM) and Gated Recurrent Unit (GRU) networks, as well as how to prepare sequential data for model training. You will practice your skills by training and evaluating a recurrent model for predicting electricity consumption.

Exercise 1: Handling sequences with PyTorch Exercise 2: Generating sequences Exercise 3: Sequential Dataset Exercise 4: Recurrent Neural Networks Exercise 5: Sequential architectures Exercise 6: Building a forecasting RNN Exercise 7: LSTM and GRU cells Exercise 8: RNN vs. LSTM vs. GRU Exercise 9: LSTM network Exercise 10: GRU network Exercise 11: Training and evaluating RNNs Exercise 12: RNN training loop Exercise 13: Evaluating forecasting models

Build multi-input and multi-output models, demonstrating how they can handle tasks requiring more than one input or generating multiple outputs. You will explore how to design and train these models using PyTorch and delve into the crucial topic of loss weighting in multi-output models. This involves understanding how to balance the importance of different tasks when training a model to perform multiple tasks simultaneously.

Exercise 1: Modèles à entrées multiples Exercise 2: Jeu de données à deux entrées Exercise 3: Modèle à deux entrées Exercise 4: Entraîner un modèle à deux entrées Exercise 5: Modèles à sorties multiples Exercise 6: Dataset et DataLoader à deux sorties Exercise 7: Architecture de modèle à deux sorties Exercise 8: Entraîner des modèles à sorties multiples Exercise 9: Évaluation des modèles à sorties multiples et pondération des pertes Exercise 10: Évaluation d’un modèle à sorties multiples

Exercice actuel

Exercise 11: Pondération des pertes Exercise 12: Récapitulatif