Gegevensset met twee inputbronnen

Een multi-inputmodel bouwen begint met het maken van een aangepaste gegevensset die alle inputs aan het model kan aanleveren. In deze oefening bouw je de Omniglot-gegevensset die triplets aanbiedt bestaande uit:

De afbeelding van een teken dat geclassificeerd moet worden,
De one-hot-gecodeerde alfabetvector van lengte 30, met overal nullen behalve één enkele één die de ID aangeeft van het alfabet waar het teken uit komt,
Het doellabel, een geheel getal tussen 0 en 963.

Je krijgt samples, een lijst van 3-tupletjes met het bestandspad van een afbeelding, de bijbehorende alfabetvector en het doellabel. Daarnaast zijn de volgende imports al voor je gedaan, dus aan de slag!

from PIL import Image
from torch.utils.data import DataLoader, Dataset
from torchvision import transforms

Deze oefening maakt deel uit van de cursus

Gevorderde Deep Learning met PyTorch

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Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

class OmniglotDataset(Dataset):
    def __init__(self, transform, samples):
        # Assign transform and samples to class attributes
        ____ = ____
        ____ = ____

Code bewerken en uitvoeren

Deze oefening maakt deel uit van de cursus

Gevorderde Deep Learning met PyTorch

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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: Multi-inputmodellen Exercise 2: Gegevensset met twee inputbronnen

Huidige oefening

Exercise 3: Model met twee invoeren Exercise 4: Twee-inputmodel trainen Exercise 5: Multi-outputmodellen Exercise 6: Dataset en DataLoader met twee uitgangen Exercise 7: Architectuur voor model met twee outputs Exercise 8: Multi-outputmodellen trainen Exercise 9: Evaluatie van multi-outputmodellen en verliesweging Exercise 10: Evaluatie van multi-outputmodel Exercise 11: Weging van de loss Exercise 12: Afronding