lab7 ready

malkova_anastasia_lab_7/README.md

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+# Лабораторная работа №7
+
+> Рекуррентная нейронная сеть и задача генерации текста
+
+### Как запустить лабораторную работу
+
+1. Установить python, conda, numpy, torch
+1. Запустить команду `python main.py` в корне проекта
+
+### Использованные технологии
+
+* Язык программирования `python`
+* Библиотеки `conda, numpy, torch`
+* Среда разработки `PyCharm`
+
+### Что делает программа?
+
+* Считывает данные из файла
+* Создает словарь всех символов и превращает текст в индексы(числа)
+* Генерирует батчи из текста
+* Создает и обучает рекуррентную нейронную сеть(RNN)
+* Генерирует новый текст
+* Измеряет ошибку
+
+#### Запуск
+
+* На первых прогонаx высокий показатель ошибки и, соответственно, качество текста плохое
+![starter result](starter_result.png)
+
+* Через 10-15 минут после обучения ошибка дошла до 0.6, для такой ошибки качество текста нормальное
+![progress result](progress_result.png)

malkova_anastasia_lab_7/config.py

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+SEQ_LEN = 256
+BATCH_SIZE = 16
+NUMBER_OF_LINES = 300
+PREDICTION_LEN = 200
+PREDICTION_LEN_START = 1000
+N_EPOCHS = 50000
+LOSS_AVG_MAX = 50
+HIDDEN_SIZE = 128
+EMBEDDING_SIZE = 128
+N_LAYERS = 2

malkova_anastasia_lab_7/data.py

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+import numpy as np
+from collections import Counter
+
+
+def create_data():
+    with open('train_text.txt', encoding="utf8") as text_file:
+        text_sample = text_file.readlines()
+    text_sample = ' '.join(text_sample)
+
+    return text_sample
+
+
+def text_to_seq(text_sample=create_data()):
+    char_counts = Counter(text_sample)
+    char_counts = sorted(char_counts.items(), key=lambda x: x[1], reverse=True)
+
+    sorted_chars = [char for char, _ in char_counts]
+
+    char_to_idx = {char: index for index, char in enumerate(sorted_chars)}
+    idx_to_char = {v: k for k, v in char_to_idx.items()}
+    sequence = np.array([char_to_idx[char] for char in text_sample])
+
+    return sequence, char_to_idx, idx_to_char

malkova_anastasia_lab_7/generation.py

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+import torch
+import torch.nn.functional as F
+import numpy as np
+from config import BATCH_SIZE, SEQ_LEN, PREDICTION_LEN
+
+
+def get_batch(sequence):
+    trains = []
+    targets = []
+    for _ in range(BATCH_SIZE):
+        batch_start = np.random.randint(0, len(sequence) - SEQ_LEN)
+        chunk = sequence[batch_start: batch_start + SEQ_LEN]
+        train = torch.LongTensor(chunk[:-1]).view(-1, 1)
+        target = torch.LongTensor(chunk[1:]).view(-1, 1)
+        trains.append(train)
+        targets.append(target)
+    return torch.stack(trains, dim=0), torch.stack(targets, dim=0)
+
+
+def evaluate(model, char_to_idx, idx_to_char, device, start_text=' ', prediction_len=PREDICTION_LEN, temp=0.3):
+    hidden = model.init_hidden()
+    idx_input = [char_to_idx[char] for char in start_text]
+    train = torch.LongTensor(idx_input).view(-1, 1, 1).to(device)
+    predicted_text = start_text
+
+    _, hidden = model(train, hidden)
+
+    inp = train[-1].view(-1, 1, 1)
+
+    for i in range(prediction_len):
+        output, hidden = model(inp.to(device), hidden)
+        output_logits = output.cpu().data.view(-1)
+        p_next = F.softmax(output_logits / temp, dim=-1).detach().cpu().data.numpy()
+        top_index = np.random.choice(len(char_to_idx), p=p_next)
+        inp = torch.LongTensor([top_index]).view(-1, 1, 1).to(device)
+        predicted_char = idx_to_char[top_index]
+        predicted_text += predicted_char
+
+    return predicted_text

malkova_anastasia_lab_7/main.py

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+from config import PREDICTION_LEN_START
+from data import text_to_seq
+from generation import evaluate
+from train import create_parameters, training
+
+if __name__ == '__main__':
+    sequence, char_to_idx, idx_to_char = text_to_seq()
+    criterion, scheduler, n_epochs, loss_avg, device, model, optimizer = create_parameters(idx_to_char)
+
+    training(n_epochs, model, sequence, device, criterion, optimizer, loss_avg, scheduler, char_to_idx, idx_to_char)
+
+    model.eval()
+
+    print(evaluate(
+        model,
+        char_to_idx,
+        idx_to_char,
+        device = device,
+        temp=0.3,
+        prediction_len=PREDICTION_LEN_START,
+        start_text='. '
+    )
+)
+

malkova_anastasia_lab_7/text_rnn.py

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+import torch
+import torch.nn as nn
+
+
+class TextRNN(nn.Module):
+
+    def __init__(self, input_size, hidden_size, embedding_size, device, n_layers=1):
+        super(TextRNN, self).__init__()
+
+        self.input_size = input_size
+        self.hidden_size = hidden_size
+        self.embedding_size = embedding_size
+        self.n_layers = n_layers
+        self.device = device
+
+        self.encoder = nn.Embedding(self.input_size, self.embedding_size)
+        self.lstm = nn.LSTM(self.embedding_size, self.hidden_size, self.n_layers)
+        self.dropout = nn.Dropout(0.2)
+        self.fc = nn.Linear(self.hidden_size, self.input_size)
+
+    def forward(self, x, hidden):
+        x = self.encoder(x).squeeze(2)
+        out, (ht1, ct1) = self.lstm(x, hidden)
+        out = self.dropout(out)
+        x = self.fc(out)
+        return x, (ht1, ct1)
+
+    def init_hidden(self, batch_size=1):
+        return (torch.zeros(self.n_layers, batch_size, self.hidden_size, requires_grad=True).to(self.device),
+                torch.zeros(self.n_layers, batch_size, self.hidden_size, requires_grad=True).to(self.device))

malkova_anastasia_lab_7/train.py

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+import torch
+import torch.nn as nn
+import numpy as np
+
+from text_rnn import TextRNN
+from config import BATCH_SIZE, N_EPOCHS, LOSS_AVG_MAX, HIDDEN_SIZE, EMBEDDING_SIZE, N_LAYERS
+from generation import get_batch, evaluate
+
+
+def create_parameters(idx_to_char):
+    device = torch.device('cuda') if torch.cuda.is_available() else torch.device('cpu')
+    model = TextRNN(input_size=len(idx_to_char), hidden_size=HIDDEN_SIZE, embedding_size=EMBEDDING_SIZE, n_layers=N_LAYERS, device=device)
+    model.to(device)
+
+    criterion = nn.CrossEntropyLoss()
+    optimizer = torch.optim.Adam(model.parameters(), lr=1e-2, amsgrad=True)
+    scheduler = torch.optim.lr_scheduler.ReduceLROnPlateau(
+        optimizer,
+        patience=5,
+        verbose=True,
+        factor=0.5
+    )
+
+    n_epochs = N_EPOCHS
+    loss_avg = []
+
+    return criterion, scheduler, n_epochs, loss_avg, device, model, optimizer
+
+
+def check_loss(loss_avg, scheduler, model, char_to_idx, idx_to_char, device):
+    if len(loss_avg) >= LOSS_AVG_MAX:
+        mean_loss = np.mean(loss_avg)
+        print(f'Loss: {mean_loss}')
+        scheduler.step(mean_loss)
+        loss_avg = []
+        model.eval()
+        predicted_text = evaluate(model, char_to_idx, idx_to_char, device=device)
+        print(predicted_text)
+    return loss_avg
+
+
+def training(n_epochs, model, sequence, device, criterion, optimizer, loss_avg, scheduler, char_to_idx, idx_to_char):
+    for epoch in range(n_epochs):
+        model.train()
+        train, target = get_batch(sequence)
+        train = train.permute(1, 0, 2).to(device)
+        target = target.permute(1, 0, 2).to(device)
+        hidden = model.init_hidden(BATCH_SIZE)
+
+        output, hidden = model(train, hidden)
+        loss = criterion(output.permute(1, 2, 0), target.squeeze(-1).permute(1, 0))
+
+        loss.backward()
+        optimizer.step()
+        optimizer.zero_grad()
+
+        loss_avg.append(loss.item())
+        loss_avg = check_loss(loss_avg, scheduler, model, char_to_idx, idx_to_char, device)