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util.py
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import tensorflow as tf
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from tensorflow.keras.applications.vgg16 import preprocess_input
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from tensorflow.keras.preprocessing.image import img_to_array
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from tensorflow.keras.preprocessing.sequence import pad_sequences
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import numpy as np
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import pickle
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CapGenerator = tf.keras.models.load_model('
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VGGMod = tf.keras.models.load_model('
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max_length = 35
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with open('models/tokenizer.pickle', 'rb') as handle:
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tokenizer = pickle.load(handle)
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vocab_size = len(tokenizer.word_index) + 1
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def idx_to_word(integer, tokenizer):
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for word, index in tokenizer.word_index.items():
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if index == integer:
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return word
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return None
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def predict_caption(model, image, tokenizer, max_length=max_length):
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# add start tag for generation process
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in_text = 'startseq'
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# iterate over the max length of sequence
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for i in range(max_length):
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# encode input sequence
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sequence = tokenizer.texts_to_sequences([in_text])[0]
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# pad the sequence
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sequence = pad_sequences([sequence], max_length)
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# predict next word
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yhat = model.predict([image, sequence], verbose=0)
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# get index with high probability
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yhat = np.argmax(yhat)
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# convert index to word
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word = idx_to_word(yhat, tokenizer)
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# stop if word not found
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if word is None:
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break
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# append word as input for generating next word
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in_text += " " + word
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# stop if we reach end tag
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if word == 'endseq':
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break
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return in_text
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def feature_extractor(image):
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# Img to np array
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image = img_to_array(image)
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# Reshaping
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image = image.reshape((1, image.shape[0], image.shape[1], image.shape[2]))
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# Preprocessing for passing through VGG16
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image = preprocess_input(image)
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feature = VGGMod.predict(image, verbose=0)
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return feature
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def generate_caption(image_name):
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y_pred = predict_caption(CapGenerator, feature_extractor(image_name), tokenizer, max_length)
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y_pred = y_pred[8:-7].upper()
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return y_pred
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import tensorflow as tf
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from tensorflow.keras.applications.vgg16 import preprocess_input
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from tensorflow.keras.preprocessing.image import img_to_array
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from tensorflow.keras.preprocessing.sequence import pad_sequences
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import numpy as np
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import pickle
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CapGenerator = tf.keras.models.load_model('CapGen.h5')
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VGGMod = tf.keras.models.load_model('VGGModel.h5')
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max_length = 35
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with open('models/tokenizer.pickle', 'rb') as handle:
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tokenizer = pickle.load(handle)
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vocab_size = len(tokenizer.word_index) + 1
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def idx_to_word(integer, tokenizer):
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for word, index in tokenizer.word_index.items():
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if index == integer:
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return word
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return None
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def predict_caption(model, image, tokenizer, max_length=max_length):
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# add start tag for generation process
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in_text = 'startseq'
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# iterate over the max length of sequence
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for i in range(max_length):
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# encode input sequence
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sequence = tokenizer.texts_to_sequences([in_text])[0]
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# pad the sequence
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sequence = pad_sequences([sequence], max_length)
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# predict next word
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yhat = model.predict([image, sequence], verbose=0)
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# get index with high probability
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yhat = np.argmax(yhat)
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# convert index to word
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word = idx_to_word(yhat, tokenizer)
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# stop if word not found
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if word is None:
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break
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# append word as input for generating next word
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in_text += " " + word
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# stop if we reach end tag
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if word == 'endseq':
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break
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return in_text
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def feature_extractor(image):
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# Img to np array
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image = img_to_array(image)
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# Reshaping
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image = image.reshape((1, image.shape[0], image.shape[1], image.shape[2]))
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# Preprocessing for passing through VGG16
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image = preprocess_input(image)
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feature = VGGMod.predict(image, verbose=0)
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return feature
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def generate_caption(image_name):
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y_pred = predict_caption(CapGenerator, feature_extractor(image_name), tokenizer, max_length)
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y_pred = y_pred[8:-7].upper()
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return y_pred
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