128 lines
3.7 KiB
Python
128 lines
3.7 KiB
Python
import random
|
|
from pathlib import Path
|
|
|
|
# FUNGSI MEMBACA PDF
|
|
def baca_pdf(path):
|
|
reader = PdfReader(path)
|
|
return "\n".join(
|
|
(p.extract_text() or "")
|
|
for p in reader.pages
|
|
)
|
|
|
|
# FUNGSI MEMOTONG TEKS (CHUNKING)
|
|
def potong(teks, ukuran=800, tumpang=100):
|
|
hasil = []
|
|
mulai = 0
|
|
while mulai < len(teks):
|
|
hasil.append(teks[mulai:mulai + ukuran])
|
|
mulai += ukuran - tumpang
|
|
return [h for h in hasil if h.strip()]
|
|
|
|
# MENCARI PDF DI FOLDER DOKUMEN
|
|
daftar_pdf = list(Path("dokumen").glob("*.pdf"))
|
|
|
|
if not daftar_pdf:
|
|
print("❌ Tidak ada file PDF di folder 'dokumen'! Pastikan Anda membuat folder bernama 'dokumen' dan memasukkan file PDF terkait KAI di dalamnya.")
|
|
else:
|
|
# Mengambil PDF pertama
|
|
pdf = daftar_pdf[0]
|
|
|
|
# Membaca isi PDF
|
|
teks = baca_pdf(pdf)
|
|
|
|
print(f"\n📄 Nama PDF: {pdf.name}")
|
|
print(f"📊 Total karakter: {len(teks)}")
|
|
|
|
# Menampilkan 500 karakter pertama
|
|
print("\n===== 500 KARAKTER PERTAMA =====")
|
|
print(teks[:500])
|
|
|
|
# Eksperimen tiga ukuran chunk
|
|
for ukuran in (500, 1000, 1500):
|
|
overlap = int(ukuran * 0.1)
|
|
chunks = potong(
|
|
teks,
|
|
ukuran=ukuran,
|
|
tumpang=overlap
|
|
)
|
|
|
|
print("\n" + "=" * 50)
|
|
print(f"UKURAN CHUNK: {ukuran}")
|
|
print(f"OVERLAP: {overlap}")
|
|
print(f"JUMLAH CHUNK: {len(chunks)}")
|
|
|
|
# Mengambil maksimal 3 chunk secara acak
|
|
sampel = random.sample(
|
|
range(len(chunks)),
|
|
min(3, len(chunks))
|
|
)
|
|
|
|
for nomor in sampel:
|
|
print(f"\n--- CHUNK {nomor} ---")
|
|
print(chunks[nomor])
|
|
|
|
|
|
# LAB 2: EMBEDDING DAN CHROMADB
|
|
if daftar_pdf:
|
|
# Model embedding multilingual
|
|
emb = embedding_functions.SentenceTransformerEmbeddingFunction(
|
|
model_name="paraphrase-multilingual-MiniLM-L12-v2"
|
|
)
|
|
|
|
# Membuat database lokal
|
|
client = chromadb.PersistentClient(path="./chroma_db")
|
|
|
|
def bangun_indeks(nama_koleksi, ukuran):
|
|
# Menghapus koleksi lama agar tidak tercampur
|
|
try:
|
|
client.delete_collection(name=nama_koleksi)
|
|
except Exception:
|
|
pass
|
|
|
|
# Membuat koleksi baru
|
|
koleksi = client.create_collection(
|
|
name=nama_koleksi,
|
|
embedding_function=emb,
|
|
metadata={"hnsw:space": "cosine"}
|
|
)
|
|
|
|
for pdf in daftar_pdf:
|
|
teks = baca_pdf(pdf)
|
|
overlap = int(ukuran * 0.1)
|
|
chunks = potong(
|
|
teks,
|
|
ukuran=ukuran,
|
|
tumpang=overlap
|
|
)
|
|
|
|
if not chunks:
|
|
print(pdf.name, "tidak memiliki teks.")
|
|
continue
|
|
|
|
koleksi.upsert(
|
|
ids=[
|
|
f"{pdf.stem}-{ukuran}-{i}"
|
|
for i in range(len(chunks))
|
|
],
|
|
documents=chunks,
|
|
metadatas=[
|
|
{
|
|
"sumber": pdf.name,
|
|
"chunk": i,
|
|
"ukuran": ukuran
|
|
}
|
|
for i in range(len(chunks))
|
|
]
|
|
)
|
|
|
|
print(pdf.name, "->", len(chunks), "chunk")
|
|
|
|
print(f"\n✅ Koleksi '{nama_koleksi}' berhasil dibuat.")
|
|
print("Total data dalam koleksi:", koleksi.count())
|
|
|
|
# Membuat dua koleksi untuk eksperimen
|
|
bangun_indeks("pedoman_500", 500)
|
|
bangun_indeks("pedoman_1000", 1000)
|
|
|
|
else:
|
|
print("⚠️ Indeks gagal dibuat karena tidak ada file PDF.") |