From 1d786de1a53a675dbadc8bac4bbe9388ac754fd7 Mon Sep 17 00:00:00 2001
From: Christian Montecchiani
 <69299238+ChristianMontecchiani@users.noreply.github.com>
Date: Fri, 14 Jan 2022 21:30:14 +0100
Subject: [PATCH] Add files via upload

---
 word_embeddings.py | 88 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 word_embeddings.py

diff --git a/word_embeddings.py b/word_embeddings.py
new file mode 100644
index 0000000..0dbde57
--- /dev/null
+++ b/word_embeddings.py
@@ -0,0 +1,88 @@
+# Standard libraries
+import numpy as np
+import pandas as pd
+
+# Sklearn
+from sklearn.model_selection import train_test_split
+
+# FastText
+import fasttext
+from os import remove
+
+
+def print_best_params(X_train: pd.DataFrame) -> None:
+    
+    # Print best parameters of FastText given from autovalidation
+
+    print('Starting autovalidation of Fast Text')
+    print("Split the dataset in training and test set")
+
+    X_valid_train, X_valid_test, _, _ = train_test_split(X_train, X_train["sentiment"], test_size=0.2, stratify= X_train["sentiment"], random_state=42)
+   
+    text_train = np.array("__label__") + X_valid_train["sentiment"].astype("str").values + np.array(" ") + X_valid_train["text"].values
+    text_valid = np.array("__label__") + X_valid_test["sentiment"].astype("str").values + np.array(" ") + X_valid_test["text"].values
+
+    np.savetxt("train.txt", text_train, fmt="%s")
+    np.savetxt("valid.txt", text_valid, fmt="%s")
+
+    print("Start autovalidation")
+    model = fasttext.train_supervised("train.txt", autotuneValidationFile="valid.txt")
+    print(" End autovalidation")
+
+    # Print hyper parameters of the FastText
+    args_obj = model.f.getArgs()
+
+    for hparam in dir(args_obj):
+        if not hparam.startswith('__'):
+            print(f"{hparam} -> {getattr(args_obj, hparam)}") 
+
+    remove("train.txt")
+    remove("valid.txt")
+
+
+def add_word_embeddings(X_valid_train: pd.DataFrame, X_valid_test: pd.DataFrame) -> tuple([pd.DataFrame, pd.DataFrame]):
+    """Add the word embeddings scores to the development and evaluation set, based on the vocabolury of the training set.
+    Parameters
+    ----------
+    X_valid_train : pd.DataFrame
+        Devolopment set dataframe
+    X_valid_test : pd.DataFrame
+        Evaluation set dataframe
+    Returns
+    -------
+    tuple([pd.DataFrame, pd.DataFrame, pd.Series])
+        A tuple with X_train, X_test and y_train
+    """
+
+    print('Starting word embeddings')
+    
+    text_train = np.array("__label__") + X_valid_train["sentiment"].astype("str").values + np.array(" ") + X_valid_train["text"].values
+    
+    np.savetxt("train.txt", text_train, fmt="%s")   
+    
+    model = fasttext.train_supervised("train.txt", epoch = 4, wordNgrams=2, bucket =  966320, dim = 126, lr =0.20158291921508406, lrUpdateRate = 100, maxn = 6,
+                                    minCount = 1, minCountLabel = 0 ,minn = 3, neg = 5, seed = 0, t= 0.0001, thread = 15, verbose = 2, ws =5)
+    remove("train.txt")
+    
+    
+    # Create features 
+    scores_dev = []
+    scores_eval = []
+
+    for text in X_valid_train["text"]:
+        prediction = model.predict(text, k=2)
+        scores_dev.append(map(lambda x : x[1], sorted(zip(prediction[0],prediction[1]), key=lambda x : x[0])))
+
+    for text in X_valid_test["text"]:
+        prediction = model.predict(text, k=2)
+        scores_eval.append(map(lambda x : x[1], sorted(zip(prediction[0],prediction[1]), key=lambda x : x[0])))
+    
+    new_features_names= ["embedding_negativity", "embedding_positivity"]
+    scores_dev = pd.DataFrame(scores_dev, columns=new_features_names)
+    scores_eval = pd.DataFrame(scores_eval, columns=new_features_names)
+    
+    
+    X_train = pd.concat([X_valid_train, scores_dev], axis = 1)
+    X_test = pd.concat([X_valid_test, scores_eval], axis=1)
+
+    return X_train, X_test
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