Deep-Learning-Image-Captioning - Implementing convolutional and recurrent neural networks in Keras to generate sentence descriptions of images

Overview

Deep Learning - Image Captioning with Convolutional and Recurrent Neural Nets

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Author: Jonathan Kuo
Python: 3.6.1
TensorFlow: 1.0.1 Keras: 2.0.4

Implementing convolutional and recurrent neural networks in Keras to generate sentence descriptions of images

Introduction


The Keras deep learning architecture of this project was inspired by Deep Visual-Semantic Alignments for Generating Image Descriptions by Andrej Karpathy and Fei-Fei Li.

Given input of a dataset of images and their sentence descriptions, define a Keras (TensorFlow backend) deep learning model that corresponds detected regions on image with description segments. This learning allows the model to output novel descriptions for test images.

Dataset


Microsoft Common Objects in Context (MSCOCO) is an image recognition, segmentation, and captioning dataset. Training data includes 123,000 images and caption pairs. Validation and testing data are both 5,000 images and caption pairs.

Architecture


VGG16 CNN architecture (loaded in Keras) with pre-trained weights on ImageNet are used as the CNN to detect objects in the image. Then, the last dense softmax 200-classification layer was removed in order to pass the 4096-D activations into into the RNN (LSTM). CNN weights are frozen and RNN weights are updated in backpropagation through time (BPTT). The CNN and LSTM is merged before passing into a second LSTM to predict the next word in the sequence. RMSprop is used as the optimizer to combat the vanishing gradient problem.

Demo


View the demo iPython notebook for the model training and prediction on the MSCOCO dataset.

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