Hallo, nets!

Je gaat een eenvoudig neuraal netwerk bouwen om te ervaren hoe snel je dit in Keras voor elkaar krijgt.

Je bouwt een netwerk dat twee getallen als input neemt, ze door een verborgen laag met 10 neuronen stuurt en uiteindelijk één niet-begrensd getal als output geeft.

Een niet-begrensde output krijg je door geen activatiefunctie in de outputlaag in te stellen. Dit is handig voor problemen zoals regressie, waarbij we willen dat de output elke niet-begrensde waarde kan aannemen.

Deze oefening maakt deel uit van de cursus

Introductie tot Deep Learning met Keras

Cursus bekijken

Oefeninstructies

Importeer het Sequential-model uit tensorflow.keras.models en de Dense-laag uit tensorflow.keras.layers.
Maak een instantie van het Sequential-model.
Voeg een verborgen Dense-laag met 10 neuronen toe met een input_shape van twee neuronen.
Voeg een laatste outputlaag met 1 neuron toe en vat je model samen met summary().

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Import the Sequential model and Dense layer
from tensorflow.keras.____ import ____
from tensorflow.keras.____ import ____

# Create a Sequential model
model = ____

# Add an input layer and a hidden layer with 10 neurons
model.add(Dense(____, input_shape=(____,), activation="relu"))

# Add a 1-neuron output layer
model.add(____)

# Summarise your model
model.____

Code bewerken en uitvoeren

Deze oefening maakt deel uit van de cursus

Introductie tot Deep Learning met Keras

SkillTag.level.intermediateSkillTag.label

4.8+

Begin de cursus gratis

In this first chapter, you will get introduced to neural networks, understand what kind of problems they can solve, and when to use them. You will also build several networks and save the earth by training a regression model that approximates the orbit of a meteor that is approaching us!

Exercise 1: Wat is Keras?Exercise 2: Keras beschrijven Exercise 3: Zou jij deep learning gebruiken?Exercise 4: Je eerste neuraal netwerk Exercise 5: Hallo, nets!

Huidige oefening

Exercise 6: Parameters tellen Exercise 7: Bouw zoals getoond!Exercise 8: Een meteorietinslag overleven Exercise 9: Een model specificeren Exercise 10: Training Exercise 11: De baan voorspellen!

By the end of this chapter, you will know how to solve binary, multi-class, and multi-label problems with neural networks. All of this by solving problems like detecting fake dollar bills, deciding who threw which dart at a board, and building an intelligent system to water your farm. You will also be able to plot model training metrics and to stop training and save your models when they no longer improve.

Exercise 1: Binary classification Exercise 2: Exploring dollar bills Exercise 3: A binary classification model Exercise 4: Is this dollar bill fake ?Exercise 5: Multi-class classification Exercise 6: A multi-class model Exercise 7: Prepare your dataset Exercise 8: Training on dart throwers Exercise 9: Softmax predictions Exercise 10: Multi-label classification Exercise 11: An irrigation machine Exercise 12: Training with multiple labels Exercise 13: Keras callbacks Exercise 14: The history callback Exercise 15: Early stopping your model Exercise 16: A combination of callbacks

In the previous chapters, you've trained a lot of models! You will now learn how to interpret learning curves to understand your models as they train. You will also visualize the effects of activation functions, batch-sizes, and batch-normalization. Finally, you will learn how to perform automatic hyperparameter optimization to your Keras models using sklearn.

Exercise 1: Learning curves Exercise 2: Learning the digits Exercise 3: Is the model overfitting?Exercise 4: Do we need more data?Exercise 5: Activation functions Exercise 6: Different activation functions Exercise 7: Comparing activation functions Exercise 8: Comparing activation functions II Exercise 9: Batch size and batch normalization Exercise 10: Changing batch sizes Exercise 11: Batch normalizing a familiar model Exercise 12: Batch normalization effects Exercise 13: Hyperparameter tuning Exercise 14: Preparing a model for tuning Exercise 15: Tuning the model parameters Exercise 16: Training with cross-validation

It's time to get introduced to more advanced architectures! You will create an autoencoder to reconstruct noisy images, visualize convolutional neural network activations, use deep pre-trained models to classify images and learn more about recurrent neural networks and working with text as you build a network that predicts the next word in a sentence.

Exercise 1: Tensors, layers, and autoencoders Exercise 2: It's a flow of tensors Exercise 3: Neural separation Exercise 4: Building an autoencoder Exercise 5: De-noising like an autoencoder Exercise 6: Intro to CNNs Exercise 7: Building a CNN model Exercise 8: Looking at convolutions Exercise 9: Preparing your input image Exercise 10: Using a real world model Exercise 11: Intro to LSTMs Exercise 12: Text prediction with LSTMs Exercise 13: Build your LSTM model Exercise 14: Decode your predictions Exercise 15: Test your model!Exercise 16: You're done!