add logistic regression

logistic-regression.py

@@ -0,0 +1,123 @@
+import pandas as pd
+import numpy as np
+import csv
+import torch
+from nltk.tokenize import word_tokenize
+from gensim import downloader
+
+FEATURES = ['content', 'id', 'label']
+PATHS = ['train/in.tsv', 'train/expected.tsv', 'dev-0/in.tsv', 'test-A/in.tsv', './dev-0/out.tsv', './test-A/out.tsv']
+PRE_TRAINED = 'word2vec-google-news-300'
+
+class NeuralNetwork(torch.nn.Module):
+    def __init__(self, INPUT_DIM):
+        super(NeuralNetwork, self).__init__()
+        self.l1 = torch.nn.Linear(INPUT_DIM, 500)
+        self.l2 = torch.nn.Linear(500, 1)
+
+    def forward(self, x):
+        x = self.l1(x)
+        x = torch.relu(x)
+        x = self.l2(x)
+        x = torch.sigmoid(x)
+        return x
+
+def get_data(FEATURES, PATHS):
+  x_train = pd.read_table(PATHS[0], error_bad_lines = False, header = None, quoting = csv.QUOTE_NONE, names = FEATURES[:2])
+  y_train = pd.read_table(PATHS[1], error_bad_lines = False, header = None, quoting = csv.QUOTE_NONE, names = FEATURES[2:])
+  x_dev = pd.read_table(PATHS[2], error_bad_lines = False, header = None, quoting = csv.QUOTE_NONE, names = FEATURES[:2])
+  x_test = pd.read_table(PATHS[3], error_bad_lines = False, header = None, quoting = csv.QUOTE_NONE, names = FEATURES[:2])
+
+  return x_train, y_train, x_dev, x_test
+
+def preprocess(x_train, y_train, x_dev, x_test):
+  x_train = x_train[FEATURES[0]].str.lower()
+  x_dev = x_dev[FEATURES[0]].str.lower()
+  x_test = x_test[FEATURES[0]].str.lower()
+  y_train = y_train[FEATURES[2]]
+
+  return x_train, y_train, x_dev, x_test
+
+def tokenize(x_train, x_dev, x_test):
+  x_train = [word_tokenize(i) for i in x_train]
+  x_dev = [word_tokenize(i) for i in x_dev]
+  x_test = [word_tokenize(i) for i in x_test]
+
+  return x_train, x_dev, x_test
+
+def use_word2vec():
+  w2v = downloader.load(PRE_TRAINED)
+
+  return w2v
+
+def document_vector(w2v, x_train, x_dev, x_test):
+  x_train = [np.mean([w2v[word] for word in doc if word in w2v] or [np.zeros(300)], axis = 0) for doc in x_train]
+  x_dev = [np.mean([w2v[word] for word in doc if word in w2v] or [np.zeros(300)], axis = 0) for doc in x_dev]
+  x_test = [np.mean([w2v[word] for word in doc if word in w2v] or [np.zeros(300)], axis = 0) for doc in x_test]
+
+  return x_train, x_dev, x_test
+
+def basic_config():
+  INPUT_DIM = 300
+  BATCH_SIZE = 5
+
+  return INPUT_DIM, BATCH_SIZE
+
+def init_model(INPUT_DIM):
+  nn_model = NeuralNetwork(INPUT_DIM)
+  criterion = torch.nn.BCELoss()
+  optimizer = torch.optim.SGD(nn_model.parameters(), lr = 0.1)
+
+  return nn_model, optimizer, criterion
+
+def train(nn_model, BATCH_SIZE, criterion, optimizer, x_train, y_train):
+  for epoch in range(5):
+    nn_model.train()
+    for i in range(0, y_train.shape[0], BATCH_SIZE):
+        X = x_train[i:i+BATCH_SIZE]
+        X = torch.tensor(X)
+        y = y_train[i:i+BATCH_SIZE]
+        y = torch.tensor(y.astype(np.float32).to_numpy()).reshape(-1, 1)
+        outputs = nn_model(X.float())
+        loss = criterion(outputs, y)
+        optimizer.zero_grad()
+        loss.backward()
+        optimizer.step()
+
+def prediction(nn_model, BATCH_SIZE, x_dev, x_test):
+  y_dev, y_test = [], []
+  nn_model.eval()
+  with torch.no_grad():
+      for i in range(0, len(x_dev), BATCH_SIZE):
+          X = x_dev[i:i+BATCH_SIZE]
+          X = torch.tensor(X)
+          outputs = nn_model(X.float())
+          prediction = (outputs > 0.5)
+          y_dev += prediction.tolist()
+      for i in range(0, len(x_test), BATCH_SIZE):
+          X = x_test[i:i+BATCH_SIZE]
+          X = torch.tensor(X)
+          outputs = nn_model(X.float())
+          prediction = (outputs > 0.5)
+          y_test += prediction.tolist()
+
+  return y_dev, y_test
+
+def get_result(y_dev, y_test):
+  np.asarray(y_dev, dtype = np.int32).tofile(PATHS[4], sep='\n')
+  np.asarray(y_test, dtype = np.int32).tofile(PATHS[5], sep='\n')
+
+def main():
+  x_train, y_train, x_dev, x_test = get_data(FEATURES, PATHS)
+  x_train, y_train, x_dev, x_test = preprocess(x_train, y_train, x_dev, x_test)
+  x_train, x_dev, x_test = tokenize(x_train, x_dev, x_test)
+  w2v = use_word2vec()
+  x_train, x_dev, x_test = document_vector(w2v, x_train, x_dev, x_test)
+  INPUT_DIM, BATCH_SIZE = basic_config()
+  nn_model, optimizer, criterion = init_model(INPUT_DIM)
+  train(nn_model, BATCH_SIZE, criterion, optimizer, x_train, y_train)
+  y_dev, y_test = prediction(nn_model, BATCH_SIZE, x_dev, x_test)
+  get_result(y_dev, y_test)
+
+if _name_ == '_main_':
+  main()