我正在尝试为我的“情绪分析”项目制作前端，但不知道如何让我的“预测功能”在前端工作

Question

我正在制作一个可用于任何语言的情绪分析项目。 这是它的工作原理：在代码的最后部分“result”将一个句子翻译成英语。 然后predict_function(result.text)将英文文本分类为正面、负面或中性。

如果我单独运行它，代码工作正常。 现在我正在尝试制作前端，唯一的问题是我无法弄清楚如何将prediction_function与它联系起来。 翻译功能在那里工作，但唯一剩下的就是在前端对翻译的文本进行分类。 我是新手，我确实做了很多改变，但无法让它发挥作用。

这是我的全部代码：（我想不需要查看整个代码，因为我觉得问题出在结尾部分，在@app.route('/', methods=['POST']) 行之后）

from flask import Flask, request, render_template
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.metrics.pairwise import cosine_similarity
import nltk
import pandas as pd
import numpy as np
import seaborn as sns
import regex as re
import math

import googletrans

from googletrans import Translator
from nltk.tokenize import word_tokenize

app = Flask(__name__)

@app.route('/')
def my_form():
    return render_template('form.html')

df = pd.read_csv('C:/Users/path/file.csv')
df = df.rename(columns = {'clean_text':'Comment'})
df.head()

df.describe()

cat = []
for val in df['category'].values:
  if val not in cat:
    cat.append(val)
print(cat)

index_arr = []
for index, val in df.iterrows():
    if val['category'] not in [-1.0, 0.0, 1.0]:
        index_arr.append(index)
print(index_arr)
df.drop(index_arr, axis = 0, inplace = True)

sns.countplot(x='category',data=df)

def clean_comments(comment):
    comment = re.sub(r'\$\w*', '', str(comment))
    comment = re.sub(r'^RT[\s]+', '', str(comment))
    comment = re.sub(r'https?:\/\/.*[\r\n]*', '', str(comment))
    comment = re.sub(r'#', '', str(comment))
    comment = re.sub(r"@[^\s]+[\s]?",'',comment)
    comment = re.sub('[^ a-zA-Z0-9]', '', comment)
    comment = re.sub('[0-9]', '', comment)
    return comment

df['Comment'] = df['Comment'].apply(clean_comments)
df.head()

nltk.download('stopwords')
from nltk.corpus import stopwords

stop_words = stopwords.words('english')

def removing_stopwords(words):
  cleaned_tokens = []
  for val in words.split(' '):
    val = val.lower()
    if val not in stop_words and val != '':
      cleaned_tokens.append(val)
  return(cleaned_tokens)

df['Comment'] = df['Comment'].apply(removing_stopwords) 
df.head()

from nltk.stem.porter import PorterStemmer

def stem_comments(words):
  ps = PorterStemmer()
  stemmed_review = []
  for review in  words:
    stemmed_review.append(ps.stem(review))
  return stemmed_review

df['Comment'] = df['Comment'].apply(stem_comments)   
df.head()

temp = df.iloc[:,0].values
X = [' '.join(ele) for ele in temp]
X = np.array(X)
Y = df.iloc[:,1].values

from sklearn.feature_extraction.text import TfidfVectorizer
vectorizer = TfidfVectorizer(max_features=5000)
X = vectorizer.fit_transform(X).toarray()
print(X.shape)

print(Y[:5])
print(Y.shape)

from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size = 0.01)

print(X_train.shape, y_train.shape, X_test.shape, y_test.shape)

del X
del Y
del temp
del df

from sklearn.naive_bayes import MultinomialNB
classifier = MultinomialNB()
classifier.fit(X_train, y_train)

y_pred = classifier.predict(X_test)

from sklearn.metrics import confusion_matrix, accuracy_score
cm = confusion_matrix(y_test, y_pred)
print(cm)
print("Accuracy = ", accuracy_score(y_pred, y_test))

import seaborn as sn
from matplotlib.figure import Figure
df_cm = pd.DataFrame(cm, index = [0,1,2],columns = [0,1,2])
f = Figure(figsize = (20,10))
sn.heatmap(df_cm, annot=True)

def predict_function(sentence):
    sentence = clean_comments(sentence)
    sentence = removing_stopwords(sentence)
    sentence = stem_comments(sentence)
    
    X = [' '.join([str(elem) for elem in sentence])]
    X = np.array(X)
    X = vectorizer.transform(X).toarray()
    
    result = classifier.predict(X)

    if result == -1.0:
        print("Negative")
    elif result == 0.0:
        print("Neutral")
    else:
        print("Positive")

@app.route('/', methods=['POST'])
def my_form_post():
    text1 = request.form['text1'].lower()

    translator = Translator(service_urls=['translate.googleapis.com'])
    result = translator.translate(text1, dest='en')
    senti=predict_function(result.text)

    return render_template('form.html', final=result.text, last=senti, text1=text1)



if __name__ == "__main__":
    app.run(debug=True, host="127.0.0.1", port=5002, threaded=True)

前端的 HTML 代码：

<body>
    <h1>Welcome To Sentiment Analyzer</h1>
    <form method="POST">
        <textarea name="text1" placeholder="Say Something: ...." rows="10" cols="109"></textarea><br><br>

        <input class="example_a" type="submit">
    </form>
    {% if final %}
    <div> 
        <h2>The Sentiment of</h2> '{{ text1 }}' <h2>is {{ final }} </h2> <h2>is {{ last }} </h2>
        {% else %}
        <p></p>
        {% endif %}
    </div>
</body>

Answer 1

在您的 predict_function 函数中，您不会返回任何值，只是打印它是否为正值。 尝试用 return 语句替换最后的那些打印语句。