tags:
- sklearn
- text-classification
language:
- nl
metrics:
- accuracy
- hamming-loss
Model card for NOS Drug-Related Text Classification on Telegram
The NOS editorial team is conducting an investigation into drug-related messages on Telegram. Thousands of Telegram messages has been labeled as drugs-related content (or not), as well including detail regarding the specific type of drugs, and delivery method. The data is utilized in order to train a model to scale it up and automatically label millions more.
Methodology
Primarily a Logistic Regression model has been trained for binary classification. Text data was converted to numeric values using the Tfidf Vectorizer, considering term frequency-inverse document frequency (TF-IDF). This transformation enables the model to learn patterns and relationships between words. The model achieved 97% accuracy on the test set. To take tasks with multiple possible labels into consideration, a MultiOutputClassifier was employed as an extension. This addresses the complexity of associating a text message with multiple categories such as "soft drugs," "hard drugs," and "medicines”. One-Hot Encoding was used for multi-label transformation. Performance evaluation utilized Hamming Loss, a metric suitable for multi-label classification. The model demonstrated a Hamming Loss of 0.04, indicating 96% accuracy per label.
Tools used to train the model
• Python
• scikit-learn
• pandas
• numpy
How to Get Started with the Model
Use the code below to get started with the model.
from joblib import load
# load the model
clf = load('model.joblib')
# make some predictions
text_messages = [
"""
Oud kleding te koop! Stuur een berichtje
We repareren ook!
""",
"""
COKE/XTC
* 1Gram = €50
* 5Gram = €230
"""]
mapping = {0:"bezorging", 1:"bulk", 2:"designer", 3:"drugsad", 4:"geendrugsad", 5:"harddrugs", 6:"medicijnen", 7: "pickup", 8: "post", 9:"softdrugs"}
labels = []
for message in clf.predict(text_messages):
label = []
for idx, labeled in enumerate(message):
if labeled == 1:
label.append(mapping[idx])
labels.append(label)
print(labels)
Details
- Shared by Dutch Public Broadcasting Foundation (NOS)
- Model type: text-classification
- Language: Dutch
- License: Creative Commons Attribution Non Commercial No Derivatives 4.0