---
base_model:
- FacebookAI/roberta-base
---

# Collective Action Participation Detection Model - RoBERTa

This model detects expressions of participation in collective action from text. For details on the framework and useful code snippets, see the paper "Extracting Participation in Collective Action from Social Media", Pera and Aiello (2025).

- A **predicted value of 0** indicates expressed participation in collective action.  
- A **predicted value of 1** indicates the lack of such an expression.

## Usage Example

To use the model, follow the example below:

```python
from transformers import AutoModelForSequenceClassification, AutoTokenizer

# Set device to CPU or GPU
import torch
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

# Load model and tokenizer
model_name = "ariannap22/collectiveaction_roberta_simplified_synthetic_weights"
model = AutoModelForSequenceClassification.from_pretrained(model_name).to(device)
tokenizer = AutoTokenizer.from_pretrained(model_name)

# Define the text you want to predict
texts = [
    "We need to stand together for our rights!",
    "I volunteer at the local food bank.",
    "This is just a casual discussion."
]

# Tokenize the input text
inputs = tokenizer(
    texts,
    padding=True,  # Pad to the longest sequence in the batch
    truncation=True,  # Truncate sequences longer than the model's max length
    max_length=512,  # Adjust max length as needed
    return_tensors="pt"  # Return PyTorch tensors
).to(device)

# Perform prediction
with torch.no_grad():
    outputs = model(**inputs)
    logits = outputs.logits  # Raw model outputs before softmax

# Convert logits to probabilities (optional)
probs = torch.nn.functional.softmax(logits, dim=-1)

# Get predicted class indices
predicted_class_indices = torch.argmax(probs, dim=-1)

# Print results
for text, idx, prob in zip(texts, predicted_class_indices, probs):
    print(f"Text: {text}")
    print(f"Predicted Class Index: {idx.item()}")
    print(f"Probabilities: {prob.tolist()}")
    print("---")