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app.py
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| 1 |
+
import os, re, pathlib, json
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| 2 |
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import numpy as np
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| 3 |
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import pandas as pd
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| 4 |
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| 5 |
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import torch
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| 6 |
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from transformers import pipeline, AutoTokenizer
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| 7 |
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from sentence_transformers import SentenceTransformer
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| 8 |
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from transformers import AutoModelForSeq2SeqLM
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import gradio as gr
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| 10 |
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| 11 |
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PROJECT_DIR = pathlib.Path(__file__).parent.resolve()
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| 12 |
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DATA_DIR = PROJECT_DIR / "data"
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| 13 |
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DATA_DIR.mkdir(parents=True, exist_ok=True)
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| 14 |
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CSV_PATH = DATA_DIR / "sample_telugu.csv"
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+
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| 16 |
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SAMPLE_ROWS = [
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| 17 |
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{"id":"te1","language":"te","context":"తెలంగాణ రాష్ట్ర రాజధాని హైదరాబాదు. ఈ నగరం ఐటి పరిశ్రమకు ప్రసిద్ధి.","question":"తెలంగాణ రాష్ట్ర రాజధాని ఏది?","answer_text":"హైదరాబాదు"},
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| 18 |
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{"id":"te2","language":"te","context":"తెలుగు భాష ద్రావిడ భాషా కుటుంబానికి చెందినది. దాని లిపి తెలుగు లిపి.","question":"తెలుగు భాష ఏ లిపిని ఉపయోగిస్తుంది?","answer_text":"తెలుగు లిపి"},
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| 19 |
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{"id":"te3","language":"te","context":"సీతాకోక చిలుకలకు రెండు రెక్కలు ఉంటాయి. ఇవి పూల మకరందం తాగుతాయి.","question":"సీతాకోక చిలుకకు ఎన్ని రెక్కలు ఉన్నాయి?","answer_text":"రెండు"},
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| 20 |
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{"id":"te4","language":"te","context":"విశాఖపట్నం ఒక తీర నగరం. ఇది ఆంధ్రప్రదేశ్లోని ప్రముఖ నౌకాశ్రయం.","question":"విశాఖపట్నం ఏ రకమైన నగరం?","answer_text":"తీర నగరం"},
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| 21 |
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{"id":"te5","language":"te","context":"చార్మినార్ హైదరాబాద్ లో ఉంది. ఇది చారిత్రక స్మారక చిహ్నం.","question":"చార్మినార్ ఎక్కడ ఉంది?","answer_text":"హైదరాబాద్"},
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| 22 |
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]
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| 23 |
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| 24 |
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def ensure_sample_csv(path: pathlib.Path):
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| 25 |
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if not path.exists():
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| 26 |
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df = pd.DataFrame(SAMPLE_ROWS)
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| 27 |
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df.to_csv(path, index=False, encoding="utf-8")
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| 28 |
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print(f"[init] Wrote sample Telugu data to {path}")
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| 29 |
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| 30 |
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ensure_sample_csv(CSV_PATH)
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| 31 |
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| 32 |
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_ZW = r"\u200b\u200c\u200d\ufeff"
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| 33 |
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ZW_RE = re.compile(f"[{_ZW}]")
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| 34 |
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| 35 |
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def normalize_text(s: str) -> str:
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| 36 |
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if not isinstance(s, str):
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return ""
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| 38 |
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s = s.replace("\u0964", "।")
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| 39 |
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s = ZW_RE.sub("", s)
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| 40 |
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s = re.sub(r"\s+", " ", s).strip()
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| 41 |
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return s
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| 42 |
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df = pd.read_csv(CSV_PATH, encoding="utf-8")
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| 44 |
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df["context_norm"] = df["context"].apply(normalize_text)
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| 45 |
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CORPUS = df["context_norm"].tolist()
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| 46 |
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| 47 |
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EMB_MODEL_NAME = "intfloat/multilingual-e5-base"
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| 48 |
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emb_model = SentenceTransformer(EMB_MODEL_NAME)
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| 49 |
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emb_model.eval()
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| 50 |
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| 51 |
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def encode_queries(texts):
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| 52 |
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texts = [normalize_text(t) for t in texts]
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| 53 |
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prefixed = [f"query: {t}" for t in texts]
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| 54 |
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with torch.inference_mode():
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| 55 |
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vecs = emb_model.encode(prefixed, normalize_embeddings=True)
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| 56 |
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return vecs
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| 57 |
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| 58 |
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def encode_passages(texts):
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| 59 |
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texts = [normalize_text(t) for t in texts]
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| 60 |
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prefixed = [f"passage: {t}" for t in texts]
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| 61 |
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with torch.inference_mode():
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| 62 |
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vecs = emb_model.encode(prefixed, normalize_embeddings=True)
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| 63 |
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return vecs
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| 64 |
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| 65 |
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PASSAGE_EMBS = encode_passages(CORPUS)
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| 66 |
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| 67 |
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def retrieve_top_k(query: str, k: int = 3):
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| 68 |
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if not query or not query.strip():
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| 69 |
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return []
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| 70 |
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qv = encode_queries([query])[0]
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| 71 |
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sims = np.dot(PASSAGE_EMBS, qv)
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| 72 |
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idxs = np.argsort(-sims)[:k]
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| 73 |
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results = []
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| 74 |
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for rank, i in enumerate(idxs):
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| 75 |
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results.append({"rank": int(rank+1), "similarity": float(sims[i]), "context": CORPUS[i]})
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| 76 |
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return results
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| 77 |
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| 78 |
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READER_MODEL = "deepset/xlm-roberta-large-squad2"
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| 79 |
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device = 0 if torch.cuda.is_available() else -1
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| 80 |
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| 81 |
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tokenizer = AutoTokenizer.from_pretrained(READER_MODEL, use_fast=True)
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| 82 |
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qa = pipeline("question-answering", model=READER_MODEL, tokenizer=tokenizer, device=device)
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| 83 |
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| 84 |
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# --- Telugu -> English translator (offline, NLLB-200) ---
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| 85 |
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# Model: facebook/nllb-200-distilled-600M
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| 86 |
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# Language codes: Telugu = 'tel_Telu', English = 'eng_Latn'
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| 87 |
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NLLB_ID = "facebook/nllb-200-distilled-600M"
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| 88 |
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nllb_tokenizer = AutoTokenizer.from_pretrained(NLLB_ID)
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| 89 |
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nllb_model = AutoModelForSeq2SeqLM.from_pretrained(NLLB_ID)
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| 90 |
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trans_te_en = pipeline(
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| 91 |
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"translation",
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| 92 |
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model=nllb_model,
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| 93 |
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tokenizer=nllb_tokenizer,
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| 94 |
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src_lang="tel_Telu",
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| 95 |
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tgt_lang="eng_Latn",
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| 96 |
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device=device
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| 97 |
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)
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| 98 |
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| 99 |
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def te_to_en(text: str) -> str:
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| 100 |
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text = (text or "").strip()
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| 101 |
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if not text:
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| 102 |
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return ""
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| 103 |
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out = trans_te_en(text, max_length=256)
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| 104 |
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return out[0]["translation_text"].strip()
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| 105 |
+
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| 106 |
+
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| 107 |
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def answer_with_context(question: str, context: str):
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| 108 |
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question = normalize_text(question)
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| 109 |
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context = normalize_text(context)
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| 110 |
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if not question or not context:
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| 111 |
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return {"answer": "", "score": 0.0}
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| 112 |
+
out = qa(question=question, context=context)
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| 113 |
+
ans = out.get("answer", "").strip()
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| 114 |
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score = float(out.get("score", 0.0))
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| 115 |
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return {"answer": ans, "score": score}
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| 116 |
+
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| 117 |
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def no_context_flow(question: str, top_k: int = 3):
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| 118 |
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cands = retrieve_top_k(question, k=top_k)
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| 119 |
+
if not cands:
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| 120 |
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return {"answer": "", "score": 0.0, "used_context": "", "retrieved": []}
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| 121 |
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best = {"answer": "", "score": -1.0, "used_context": ""}
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| 122 |
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for c in cands:
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| 123 |
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out = answer_with_context(question, c["context"])
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| 124 |
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if out["score"] > best["score"]:
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| 125 |
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best = {"answer": out["answer"], "score": out["score"], "used_context": c["context"]}
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| 126 |
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return {"answer": best["answer"], "score": best["score"], "used_context": best["used_context"], "retrieved": cands}
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| 127 |
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| 128 |
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INTRO_MD = """
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| 129 |
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### ShabdaAI
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| 130 |
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- **మోడ్ 1:** నేను ఇచ్చే ప్యాసేజ్ (context) పై సమాధానం ఇవ్వు
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| 131 |
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- **మోడ్ 2:** ప్యాసేజ్ ఇవ్వకపోతే — చిన్న తెలుగు కార్పస్లో *సెర్చ్ → రీడ్* చేసి సమాధానం ఇవ్వు
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| 132 |
+
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| 133 |
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> Models: **intfloat/multilingual-e5-base** (retrieval) + **deepset/xlm-roberta-large-squad2** (extractive QA)
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| 134 |
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"""
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| 135 |
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| 136 |
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def ui_answer(mode, translate_outputs_en, translate_inputs_en, question, user_context, top_k):
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| 137 |
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question = question or ""
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| 138 |
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user_context = user_context or ""
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| 139 |
+
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| 140 |
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# Optional English translations of inputs
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| 141 |
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q_en = te_to_en(question) if translate_inputs_en and question else ""
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| 142 |
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ctx_en = te_to_en(user_context) if translate_inputs_en and user_context else ""
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| 143 |
+
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| 144 |
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if mode == "With my context":
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| 145 |
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res = answer_with_context(question, user_context)
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| 146 |
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ans_te = res["answer"]
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| 147 |
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ans_en = te_to_en(ans_te) if translate_outputs_en and ans_te else ""
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| 148 |
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return ans_te, ans_en, f"{res['score']:.3f}", user_context, ctx_en or "—", q_en or "—", "—"
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| 149 |
+
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| 150 |
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else:
|
| 151 |
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res = no_context_flow(question, top_k=int(top_k))
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| 152 |
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ans_te = res["answer"]
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| 153 |
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ans_en = te_to_en(ans_te) if translate_outputs_en and ans_te else ""
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| 154 |
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retrieved_tbl = "\n".join(
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| 155 |
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[f"{r['rank']}. (sim={r['similarity']:.3f}) {r['context']}" for r in res.get("retrieved", [])]
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| 156 |
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) or "—"
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| 157 |
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return ans_te, ans_en, f"{res['score']:.3f}", res["used_context"], ctx_en or "—", q_en or "—", retrieved_tbl
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| 158 |
+
|
| 159 |
+
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| 160 |
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with gr.Blocks() as demo:
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| 161 |
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gr.Markdown(INTRO_MD)
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| 162 |
+
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| 163 |
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with gr.Row():
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| 164 |
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mode = gr.Radio(
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| 165 |
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choices=["With my context", "No context (search sample data)"],
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| 166 |
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value="With my context",
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| 167 |
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label="Mode"
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| 168 |
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)
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| 169 |
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top_k = gr.Slider(1, 5, value=3, step=1, label="Top-K passages (for No-context mode)")
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| 170 |
+
with gr.Row():
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| 171 |
+
translate_outputs_en = gr.Checkbox(value=True, label="Translate ANSWER (Telugu → English)")
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| 172 |
+
translate_inputs_en = gr.Checkbox(value=True, label="Translate INPUTS (Question/Context → English)")
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| 173 |
+
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| 174 |
+
question = gr.Textbox(label="ప్రశ్న (Question)", placeholder="ఉదా: చార్మినార్ ఎక్కడ ఉంది?")
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| 175 |
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user_context = gr.Textbox(label="ప్యాసేజ్ / కాంటెక్స్ట్ (optional)", lines=4)
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| 176 |
+
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| 177 |
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btn = gr.Button("Answer")
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| 178 |
+
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| 179 |
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# Answers
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| 180 |
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answer_te = gr.Textbox(label="Answer (Telugu)")
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| 181 |
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answer_en = gr.Textbox(label="Answer (English)")
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| 182 |
+
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| 183 |
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# Confidence + contexts
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| 184 |
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score = gr.Textbox(label="Confidence score")
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| 185 |
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used_ctx = gr.Textbox(label="Used context (Telugu)")
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| 186 |
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ctx_en_box = gr.Textbox(label="Used context (English)")
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| 187 |
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q_en_box = gr.Textbox(label="Question (English)")
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| 188 |
+
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| 189 |
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retrieved = gr.Textbox(label="Top-K retrieved passages (Telugu)", lines=4)
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| 190 |
+
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| 191 |
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btn.click(
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| 192 |
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fn=ui_answer,
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| 193 |
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inputs=[mode, translate_outputs_en, translate_inputs_en, question, user_context, top_k],
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| 194 |
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outputs=[answer_te, answer_en, score, used_ctx, ctx_en_box, q_en_box, retrieved]
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| 195 |
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)
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| 196 |
+
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| 197 |
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if __name__ == "__main__":
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| 198 |
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os.environ["HF_HUB_DISABLE_TELEMETRY"] = "1"
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| 199 |
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demo.launch(server_name="0.0.0.0", server_port=7860, show_api=False)
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