cesnimda
342 lines
11 KiB
Python
342 lines
11 KiB
Python
from fastapi import FastAPI, HTTPException
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from pydantic import BaseModel, Field
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from transformers import AutoTokenizer, AutoModelForSeq2SeqLM
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from cachetools import TTLCache
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import hashlib
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import re
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import torch
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app = FastAPI(title="Local Summarizer")
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MODEL_NAME = "sshleifer/distilbart-cnn-12-6"
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MAX_INPUT_CHARS = 20000
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MAX_CONTEXT_CHARS = 2200
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def _load_runtime():
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tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME)
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model = AutoModelForSeq2SeqLM.from_pretrained(MODEL_NAME)
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model.eval()
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has_cuda = torch.cuda.is_available()
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device = torch.device("cuda" if has_cuda else "cpu")
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model.to(device)
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gpu_name = torch.cuda.get_device_name(0) if has_cuda else None
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return tokenizer, model, device, has_cuda, gpu_name
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tokenizer, model, device, GPU_AVAILABLE, GPU_NAME = _load_runtime()
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cache = TTLCache(maxsize=1024, ttl=60 * 60)
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class SummarizeRequest(BaseModel):
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text: str = Field(min_length=1, max_length=MAX_INPUT_CHARS)
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max_length: int = Field(default=160, ge=24, le=256)
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min_length: int = Field(default=45, ge=8, le=180)
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top_skills: int = Field(default=8, ge=3, le=12)
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def _key(text: str, max_length: int, min_length: int, top_skills: int) -> str:
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h = hashlib.sha256(text.encode("utf-8")).hexdigest()
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return f"{h}:{max_length}:{min_length}:{top_skills}"
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@app.get("/health")
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async def health():
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return {
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"ok": True,
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"model": MODEL_NAME,
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"device": str(device),
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"gpu_available": GPU_AVAILABLE,
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"gpu_name": GPU_NAME,
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}
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_TECH = [
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"python", "c#", "dotnet", ".net", "java", "javascript", "typescript", "react", "node", "sql",
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"postgres", "postgresql", "mysql", "sqlite", "mongodb", "redis", "aws", "azure", "gcp",
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"docker", "kubernetes", "terraform", "linux", "git", "ci/cd", "graphql", "rest",
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]
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_SOFT = [
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"communication", "collaboration", "teamwork", "problem solving", "leadership", "mentoring",
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"ownership", "initiative", "adaptability", "stakeholder management", "detail oriented",
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]
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_TECH_PRIORITY = [
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"python", "c#", ".net", "dotnet", "typescript", "javascript", "react", "node",
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"sql", "postgresql", "postgres", "mysql", "sqlite", "docker", "kubernetes",
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"aws", "azure", "gcp", "terraform", "graphql", "rest", "git",
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]
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_MUST_HAVE_HINTS = [
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"must have", "required", "requirements", "you have", "you bring", "essential", "we are looking for",
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]
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_NICE_TO_HAVE_HINTS = [
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"nice to have", "bonus", "preferred", "advantageous", "extra plus",
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]
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_SCREENING_HINTS = [
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"experience with", "hands-on", "demonstrated", "proven", "track record", "delivered",
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]
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def _rank_tech_skills(skills):
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ordered = []
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seen = set()
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for preferred in _TECH_PRIORITY:
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for skill in skills:
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if skill == preferred and skill not in seen:
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ordered.append(skill)
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seen.add(skill)
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for skill in skills:
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if skill not in seen:
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ordered.append(skill)
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seen.add(skill)
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return ordered
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def _strip_html(text: str) -> str:
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text = re.sub(r"<\s*br\s*/?>", "\n", text, flags=re.IGNORECASE)
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text = re.sub(r"</p\s*>", "\n", text, flags=re.IGNORECASE)
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text = re.sub(r"<[^>]+>", " ", text)
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return re.sub(r"\n{3,}", "\n\n", text).strip()
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def _extract_bullets(lines, max_items=8):
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out = []
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for ln in lines:
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s = ln.strip()
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if not s:
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continue
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if re.match(r"^([-*]|\u2022)\s+", s):
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s = re.sub(r"^([-*]|\u2022)\s+", "", s).strip()
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if 3 <= len(s) <= 220:
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out.append(s)
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if len(out) >= max_items:
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break
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return out
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def _top_keywords(text: str, limit=6):
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words = re.findall(r"[a-zA-Z][a-zA-Z+#./-]{2,}", text.lower())
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stop = {
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"with", "from", "that", "this", "will", "have", "your", "their", "about", "role", "team", "work",
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"experience", "skills", "requirements", "responsibilities", "company", "using", "ability", "years",
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"looking", "candidate", "position", "working", "across", "strong", "building", "support",
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}
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counts = {}
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for word in words:
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if word in stop or word in _TECH or word in _SOFT:
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continue
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counts[word] = counts.get(word, 0) + 1
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ordered = sorted(counts.items(), key=lambda item: (-item[1], item[0]))
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return [word for word, _ in ordered[:limit]]
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def _first_matching_sentences(text: str, hints, limit=3):
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sentences = re.split(r"(?<=[.!?])\s+", text)
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found = []
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for sentence in sentences:
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low = sentence.lower()
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if any(hint in low for hint in hints):
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cleaned = sentence.strip()
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if 20 <= len(cleaned) <= 220:
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found.append(cleaned)
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if len(found) >= limit:
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break
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return found
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def _trim_line(text: str, max_len: int = 140) -> str:
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text = re.sub(r"\s+", " ", text).strip(" -•\t")
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if len(text) <= max_len:
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return text
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return text[: max_len - 1].rstrip() + "…"
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def _role_focused_excerpt(text: str) -> dict:
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cleaned = _strip_html(text)
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lines = [ln.strip() for ln in cleaned.splitlines()]
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headings = {
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"responsibilities": ["responsibilities", "what you will do", "what you'll do", "the role", "your role", "you will"],
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"requirements": ["requirements", "what we are looking for", "what we're looking for", "skills", "experience", "must have"],
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"nice": ["nice to have", "bonus", "preferred"],
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}
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def match_heading(s: str):
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sl = s.lower().strip(":-\x7f ")
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for key, words in headings.items():
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for word in words:
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if sl == word or sl.startswith(word + " "):
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return key
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return None
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section = None
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resp_lines = []
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req_lines = []
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nice_lines = []
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for ln in lines:
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if not ln:
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continue
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heading = match_heading(ln)
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if heading:
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section = heading
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continue
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if section == "responsibilities":
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resp_lines.append(ln)
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elif section == "requirements":
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req_lines.append(ln)
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elif section == "nice":
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nice_lines.append(ln)
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responsibilities = _extract_bullets(resp_lines, max_items=7)
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requirements = _extract_bullets(req_lines, max_items=7)
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nice = _extract_bullets(nice_lines, max_items=5)
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tech_found = []
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soft_found = []
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low = cleaned.lower()
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for t in _TECH:
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if t in low:
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tech_found.append(t)
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for s in _SOFT:
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if s in low:
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soft_found.append(s)
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if not responsibilities and not requirements:
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any_bullets = _extract_bullets(lines, max_items=10)
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responsibilities = any_bullets[:6]
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requirements = any_bullets[6:10]
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if not requirements:
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requirements = [_trim_line(x) for x in _first_matching_sentences(cleaned, _MUST_HAVE_HINTS, limit=4)]
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if not nice:
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nice = [_trim_line(x) for x in _first_matching_sentences(cleaned, _NICE_TO_HAVE_HINTS, limit=3)]
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focused_parts = []
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if responsibilities:
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focused_parts.append("Responsibilities:\n- " + "\n- ".join(responsibilities))
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if requirements:
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focused_parts.append("Requirements:\n- " + "\n- ".join(requirements))
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if nice:
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focused_parts.append("Nice to have:\n- " + "\n- ".join(nice))
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focused_parts.append("Context:\n" + cleaned[:MAX_CONTEXT_CHARS])
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screen_focus = []
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for item in requirements[:4]:
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if any(hint in item.lower() for hint in _SCREENING_HINTS) or len(screen_focus) < 2:
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screen_focus.append(_trim_line(item))
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if not screen_focus:
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screen_focus = [_trim_line(x) for x in _first_matching_sentences(cleaned, _SCREENING_HINTS, limit=3)]
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return {
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"cleaned": cleaned,
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"focused_input": "\n\n".join(focused_parts),
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"responsibilities": responsibilities,
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"requirements": requirements,
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"nice": nice,
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"tech": tech_found,
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"soft": soft_found,
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"keywords": _top_keywords(cleaned),
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"screen_focus": screen_focus[:3],
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}
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def _model_summarize(text: str, max_length: int, min_length: int) -> str:
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inputs = tokenizer(text, return_tensors="pt", truncation=True, max_length=1024)
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input_ids = inputs.input_ids.to(device)
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attention_mask = inputs.attention_mask.to(device) if hasattr(inputs, "attention_mask") else None
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with torch.no_grad():
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outputs = model.generate(
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input_ids,
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attention_mask=attention_mask,
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max_length=max_length,
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min_length=min_length,
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num_beams=3,
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length_penalty=1.0,
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no_repeat_ngram_size=3,
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early_stopping=True,
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)
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return tokenizer.decode(outputs[0], skip_special_tokens=True).strip()
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@app.post("/summarize")
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async def summarize(req: SummarizeRequest):
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if req.min_length >= req.max_length:
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raise HTTPException(status_code=400, detail="min_length must be smaller than max_length.")
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key = _key(req.text, req.max_length, req.min_length, req.top_skills)
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if key in cache:
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return {"summary": cache[key], "cached": True}
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info = _role_focused_excerpt(req.text)
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summary = _model_summarize(info["focused_input"], req.max_length, req.min_length)
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ranked_tech = []
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for t in _rank_tech_skills(info["tech"]):
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if t not in ranked_tech:
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ranked_tech.append(t)
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uniq_soft = []
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for s in info["soft"]:
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if s not in uniq_soft:
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uniq_soft.append(s)
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lines = ["Role summary:", summary]
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if info["requirements"]:
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lines.append("")
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lines.append("What the company wants most:")
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for x in info["requirements"][:5]:
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lines.append(f"- {_trim_line(x)}")
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if ranked_tech:
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lines.append("")
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lines.append("Top hard skills:")
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for skill in ranked_tech[: req.top_skills]:
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lines.append(f"- {skill}")
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if info["keywords"]:
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lines.append("")
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lines.append("Keywords to mirror:")
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for keyword in info["keywords"][:5]:
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lines.append(f"- {keyword}")
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if info["responsibilities"]:
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lines.append("")
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lines.append("What you would be doing:")
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for x in info["responsibilities"][:4]:
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lines.append(f"- {_trim_line(x)}")
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if info["nice"]:
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lines.append("")
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lines.append("Nice to have:")
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for x in info["nice"][:3]:
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lines.append(f"- {_trim_line(x)}")
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if uniq_soft:
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lines.append("")
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lines.append("Relevant soft skills:")
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for soft in uniq_soft[:5]:
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lines.append(f"- {soft}")
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lines.append("")
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lines.append("Interview focus:")
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if info["screen_focus"]:
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for x in info["screen_focus"]:
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lines.append(f"- Be ready to prove: {_trim_line(x)}")
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elif info["requirements"]:
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for x in info["requirements"][:3]:
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lines.append(f"- Prepare examples that demonstrate: {_trim_line(x)}")
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elif ranked_tech:
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for x in ranked_tech[:3]:
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lines.append(f"- Be ready to explain your hands-on experience with {x}")
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else:
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lines.append("- Prepare examples showing relevant impact, collaboration, and delivery.")
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out = "\n".join(lines).strip()
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cache[key] = out
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return {"summary": out, "cached": False}
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