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fix bug on text generator code
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‎machine-learning/nlp/text-generator/text-generator-v2.ipynb

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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"import tensorflow as tf\r\n",
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"import numpy as np\r\n",
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"import os\r\n",
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"import pickle\r\n",
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"\r\n",
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"SEQUENCE_LENGTH = 50\r\n",
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"EMBEDDING_DIM = 200\r\n",
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"BATCH_SIZE = 128\r\n",
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"FILE_PATH = \"data/python_code.py\"\r\n",
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"BASENAME = os.path.basename(FILE_PATH) + \"-lower\"\r\n",
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"\r\n",
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"text = open(FILE_PATH).read()\r\n",
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"# comment this if you want to use uppercase letters\r\n",
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"text = text.lower()\r\n",
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"n_chars = len(text)\r\n",
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"vocab = ''.join(sorted(set(text)))\r\n",
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"print(\"vocab:\", vocab)\r\n",
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"n_unique_chars = len(vocab)\r\n",
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"print(\"Number of characters:\", n_chars)\r\n",
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"print(\"Number of unique characters:\", n_unique_chars)"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"# dictionary that converts characters to integers\r\n",
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"char2int = {c: i for i, c in enumerate(vocab)}\r\n",
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"# dictionary that converts integers to characters\r\n",
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"int2char = {i: c for i, c in enumerate(vocab)}\r\n",
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"\r\n",
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"# save these dictionaries for later generation\r\n",
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"pickle.dump(char2int, open(f\"{BASENAME}-char2int.pickle\", \"wb\"))\r\n",
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"pickle.dump(int2char, open(f\"{BASENAME}-int2char.pickle\", \"wb\"))"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"encoded_text = np.array([char2int[c] for c in text])"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"char_dataset = tf.data.Dataset.from_tensor_slices(encoded_text)\r\n",
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"for element in char_dataset.take(5):\r\n",
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" print(element.numpy())"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"for element in char_dataset.batch(SEQUENCE_LENGTH+1).shuffle(1024).take(2):\r\n",
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" print(''.join([int2char[c] for c in element.numpy()]))"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"#help(tf.one_hot)\r\n",
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"#help(char_dataset.window)\r\n",
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"windows = char_dataset.window(SEQUENCE_LENGTH+1, shift=1, drop_remainder=True)\r\n",
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"sequences = windows.flat_map(lambda window: window.batch(SEQUENCE_LENGTH+1))\r\n",
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"dataset = sequences.map(lambda x: (x[:-1], x[-1]))\r\n",
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"for input_, target in dataset.take(10):\r\n",
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" print(input_.numpy().shape)\r\n",
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" print(target.numpy().shape)\r\n",
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" print(''.join([int2char[c] for c in input_.numpy()]), int2char[target.numpy()])\r\n",
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" print(\"=\"*50)"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"sequences2 = char_dataset.batch(2*SEQUENCE_LENGTH+1, drop_remainder=True)\r\n",
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"\r\n",
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"def split_sample(sample):\r\n",
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" ds = tf.data.Dataset.from_tensors((sample[:SEQUENCE_LENGTH], sample[SEQUENCE_LENGTH]))\r\n",
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" for i in range(1, (len(sample)-1) // 2):\r\n",
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" input_ = sample[i:i+SEQUENCE_LENGTH]\r\n",
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" target = sample[i+SEQUENCE_LENGTH]\r\n",
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" other_ds = tf.data.Dataset.from_tensors((input_, target))\r\n",
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" ds = ds.concatenate(other_ds)\r\n",
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" return ds\r\n",
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"\r\n",
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"\r\n",
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"dataset2 = sequences2.flat_map(split_sample)\r\n",
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"for element in dataset2.take(10):\r\n",
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" print(element[0].shape, element[1].shape)\r\n",
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" print(''.join([int2char[c] for c in element[0].numpy()]), int2char[element[1].numpy()])"
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],
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"outputs": [],
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"metadata": {
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"tags": [
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"outputPrepend",
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"outputPrepend",
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"outputPrepend",
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"outputPrepend"
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]
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}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"for element1, element2 in zip(dataset.take(5), dataset2.take(5)):\r\n",
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" print(element1[0].numpy() == element2[0].numpy())\r\n",
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" "
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"def one_hot_samples(input_, target):\r\n",
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" return tf.one_hot(input_, len(vocab)), tf.one_hot(target, len(vocab))\r\n",
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"# return input_, tf.one_hot(target, len(vocab))\r\n",
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"\r\n",
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"dataset = dataset.map(one_hot_samples)\r\n",
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"dataset2 = dataset2.map(one_hot_samples)\r\n",
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"for element in dataset.take(10):\r\n",
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" print(element[0].shape, element[1].shape)"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"ds = dataset.shuffle(1024).batch(BATCH_SIZE, drop_remainder=True).cache().prefetch(1).repeat()\r\n",
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"ds2 = dataset2.shuffle(1024).batch(BATCH_SIZE, drop_remainder=True).cache().prefetch(1).repeat()"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"def create_model(vocab_size, embedding_dim, rnn_units, batch_size):\r\n",
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" model = tf.keras.Sequential()\r\n",
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" # model.add(tf.keras.layers.Embedding(vocab_size, embedding_dim, input_shape=(SEQUENCE_LENGTH,)))\r\n",
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" model.add(tf.keras.layers.LSTM(rnn_units, input_shape=(SEQUENCE_LENGTH, len(vocab)), return_sequences=True))\r\n",
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" model.add(tf.keras.layers.Dropout(0.3))\r\n",
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" model.add(tf.keras.layers.LSTM(rnn_units)),\r\n",
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" model.add(tf.keras.layers.Dropout(0.3))\r\n",
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" model.add(tf.keras.layers.Dense(vocab_size, activation=\"softmax\"))\r\n",
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" return model"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"model = create_model(len(vocab), embedding_dim=EMBEDDING_DIM, rnn_units=128, batch_size=BATCH_SIZE)\r\n",
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"model.summary()\r\n",
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"model.compile(optimizer=\"adam\", loss=\"categorical_crossentropy\", metrics=[\"accuracy\"])"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"EPOCHS = 5\r\n",
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"history = model.fit(ds2, steps_per_epoch=(len(encoded_text) - SEQUENCE_LENGTH ) // BATCH_SIZE, epochs=EPOCHS)"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"# save the model\r\n",
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"model_path = f\"results/{BASENAME}-{SEQUENCE_LENGTH}-NOEMBEDDING-moredata.h5\"\r\n",
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"model.save(model_path)\r\n",
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"# model.load_weights(model_path)"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"seed = \"\"\"You can be a\"\"\".lower()\r\n",
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"s = seed\r\n",
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"# generate 400 characters\r\n",
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"generated = \"\"\r\n",
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"for i in range(200):\r\n",
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" # make the input sequence\r\n",
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" X = np.zeros((1, SEQUENCE_LENGTH, len(vocab)))\r\n",
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" # X = np.zeros((1, SEQUENCE_LENGTH))\r\n",
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" for t, char in enumerate(seed):\r\n",
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" X[0, (SEQUENCE_LENGTH - len(seed)) + t, char2int[char]] = 1\r\n",
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" # predict the next character\r\n",
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" predicted = model.predict(X, verbose=0)[0]\r\n",
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" # print(predicted)\r\n",
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" # converting the vector to an integer\r\n",
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" next_index = np.argmax(predicted)\r\n",
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"# next_index = np.squeeze(np.round(predicted))\r\n",
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" # converting the integer to a character\r\n",
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"# print(next_index)\r\n",
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" next_char = int2char[next_index]\r\n",
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" # add the character to results\r\n",
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" generated += next_char\r\n",
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" # shift seed and the predicted character\r\n",
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" seed = seed[1:] + next_char\r\n",
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"\r\n",
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"print(\"Generated text:\")\r\n",
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"print(s + generated)"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [
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"char2int\r\n"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"outputs": [],
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"metadata": {}
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}
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],
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"metadata": {
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"file_extension": ".py",
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"kernelspec": {
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"name": "python3",
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"display_name": "Python 3.8.7 64-bit"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.8.7"
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},
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"mimetype": "text/x-python",
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"name": "python",
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"npconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": 3,
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"interpreter": {
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"hash": "777490da48e046e3b512f0b24bf037db286a787493a11bf82a9e0f2cbf21bb67"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 4
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}

‎machine-learning/nlp/text-generator/train.py

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Original file line numberDiff line numberDiff line change
@@ -113,7 +113,10 @@ def one_hot_samples(input_, target):
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Dense(n_unique_chars, activation="softmax"),
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])
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model.load_weights(f"results/{BASENAME}-{sequence_length}.h5")
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# define the model path
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model_weights_path = f"results/{BASENAME}-{sequence_length}.h5"
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# if os.path.isfile(model_weights_path):
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# model.load_weights(model_weights_path)
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model.summary()
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model.compile(loss="categorical_crossentropy", optimizer="adam", metrics=["accuracy"])
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# train the model
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model.fit(ds, steps_per_epoch=(len(encoded_text) - sequence_length) // BATCH_SIZE, epochs=EPOCHS)
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# save the model
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model.save(f"results/{BASENAME}-{sequence_length}.h5")
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model.save(model_weights_path)

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