app.py

import gradio as gr
import torch
import torch.nn as nn
from transformers import AutoTokenizer, AutoConfig, BertModel, BertPreTrainedModel
from safetensors.torch import load_file
import gc

# Release memory
gc.collect()
torch.cuda.empty_cache()

model_name = "hfl/chinese-roberta-wwm-ext"

class MultiTaskRoBert(BertPreTrainedModel):
    def __init__(self, config, model_name):
        super().__init__(config)
        # Load backbone with pretrained weights if desired
        self.bert = BertModel.from_pretrained(model_name, config=config)
        self.classifier = nn.Linear(config.hidden_size, 3)
        self.regressor = nn.Linear(config.hidden_size, 5)

    def forward(self, input_ids, attention_mask=None, token_type_ids=None):
        outputs = self.bert(input_ids, attention_mask=attention_mask, token_type_ids=token_type_ids)
        pooled = outputs.pooler_output
        sentiment_logits = self.classifier(pooled)
        regression_outputs = self.regressor(pooled)
        return {"logits": sentiment_logits, "regression_outputs": regression_outputs}

device = "cpu"
print(f"Device: {device}")

model_path = "model1.safetensors"

# Load tokenizer
tokenizer = AutoTokenizer.from_pretrained(model_name)
config = AutoConfig.from_pretrained(model_name)

model = MultiTaskRoBert(config, model_name).to(device)
state_dict = load_file(model_path, device="cpu")
model.load_state_dict(state_dict)
model.eval()

# Use half precision to reduce memory usage
# if device.type == 'cuda':
#     model.half()

def predict(text: str):
    try:
        inputs = tokenizer(
            text,
            return_tensors="pt",
            truncation=True,
            padding="max_length",
            max_length=128
        )

        inputs = {k: v.to(device) for k, v in inputs.items()}

        with torch.no_grad():
            out = model(**inputs)

        pred_class = torch.argmax(out["logits"], dim=-1).item()
        sentiment_map = {0: "正面", 1: "負面", 2: "中立"}

        reg_results = out["regression_outputs"][0].cpu().numpy()
        
        for i in range(len(reg_results)):
            if reg_results[i] < 0:
                reg_results[i] = 0
            elif reg_results[i] > 5:
                reg_results[i] = 5
        
        rating, delight, anger, sorrow, happiness = reg_results

        return {
            "情感": sentiment_map[pred_class],
            "強度": round(rating, 2),
            "喜": round(delight, 2),
            "怒": round(anger, 2),
            "哀": round(sorrow, 2),
            "樂": round(happiness, 2),
        }
    except Exception as e:
        return {"错误": f"处理失败: {str(e)}"}

article = "Author: Lu Yuk Tong, [Github Link](https://github.com/LutherYTT/Cantonese-Sentiment-Analysis-System-Multitasking-Learning-on-Scarce-Data)"
# Create Gradio interface
iface = gr.Interface(
    fn=predict,
    inputs=gr.Textbox(lines=3, placeholder="請輸入粵語文本...", label="粵語文本"),
    outputs=gr.JSON(label="分析結果"),
    title="粵語情感與情緒分析",
    description="輸入粵語文本，分析情感(正面/負面/中立)和五種情緒評分",
    examples=[
        ["呢個plan聽落唔錯，我哋試下先啦。"],
        ["份proposal 你send 咗俾client未？Deadline 係EOD呀。"],
        ["返工返到好攰，但係見到同事就feel better啲。"],
        ["你今次嘅presentation做得唔錯，我好 impressed！"],
        ["夜晚聽到嗰啲聲，我唔敢出房門。"],
        ["個client 真係好 difficult 囉，改咗n 次 requirements，仲要urgent，chur 到痴線！"],
        ["我尋日冇乜特別事做，就係喺屋企睇電視。"],
        ["Weekend 去staycation，間酒店個view 正到爆！"],
        ["做乜嘢都冇意義。"],
        ["今朝遲到咗，差啲miss咗個重要meeting"],
    ],
    article=article,
)

if __name__ == "__main__":
    iface.launch(share=True, show_error=True)