semsearch_Hld04_Working.py

import weaviate

from sentence_transformers import SentenceTransformer
from langchain_community.document_loaders import BSHTMLLoader
from pathlib import Path
from lxml import html
import logging
from semantic_text_splitter import HuggingFaceTextSplitter
from tokenizers import Tokenizer
import json
import os
import re
import logging

weaviate_logger = logging.getLogger("httpx")
weaviate_logger.setLevel(logging.WARNING)

logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO)



######################################################################
# MAINLINE
#
logger.info("#### MAINLINE ENTERED.")

#pathString = "/Users/660565/KPSAllInOne/ProgramFilesX86/WebCopy/DownloadedWebSites/LLMPOC_HTML" 
pathString = "/app/inputDocs"
chunks = []
webpageDocNames = []
page_contentArray = []
webpageChunks = []
webpageTitles = []
webpageChunksDocNames = []


#######################################################
# Read each text input file, parse it into a document,
# chunk it, collect chunks and document name.
logger.info("#### Read and chunk input text files.")
for filename in os.listdir(pathString):
    logger.info(filename)
    path = Path(pathString + "/" + filename)
    filename = filename.rstrip(".html")
    webpageDocNames.append(filename)
    htmlLoader = BSHTMLLoader(path,"utf-8") 
    htmlData = htmlLoader.load()

    title   = htmlData[0].metadata['title']
    page_content = htmlData[0].page_content
    
    # Clean data. Remove multiple newlines, etc.
    page_content = re.sub(r'\n+', '\n',page_content)
    
    page_contentArray.append(page_content);
    webpageTitles.append(title)
    max_tokens = 1000
    tokenizer = Tokenizer.from_pretrained("bert-base-uncased")
    logger.debug(f"### tokenizer: {tokenizer}")
    splitter = HuggingFaceTextSplitter(tokenizer, trim_chunks=True)
    chunksOnePage = splitter.chunks(page_content, chunk_capacity=50)

    chunks = []
    for chnk in chunksOnePage:
        logger.debug(f"#### chnk in file: {chnk}")
        chunks.append(chnk)
        logger.debug(f"chunks: {chunks}")
    webpageChunks.append(chunks)
    webpageChunksDocNames.append(filename + "Chunks")

    logger.debug(f"### filename, title: {filename}, {title}")
    
logger.debug(f"### webpageDocNames: {webpageDocNames}")


######################################################
# Connect to the Weaviate vector database.
logger.info("#### Create Weaviate db client connection.")
client = weaviate.connect_to_custom(
    http_host="127.0.0.1",
    http_port=8080,
    http_secure=False,
    grpc_host="127.0.0.1",
    grpc_port=50051,
    grpc_secure=False
    #read_timeout=600,
    #write_timeout=90
)
client.connect() 


######################################################
# Create database webpage and chunks collections.
#wpCollection = createWebpageCollection()
#wpChunkCollection = createChunksCollection()
logger.info("#### createWebpageCollection() entered.")
if client.collections.exists("Documents"):
    client.collections.delete("Documents")

class_obj = {
  "class": "Documents",
  "description": "For first attempt at loading a Weviate database.",
  "vectorizer": "text2vec-transformers",
  "moduleConfig": {
    "text2vec-transformers": {
    "vectorizeClassName": False
    }
  },
  "vectorIndexType": "hnsw",  
  "vectorIndexConfig": {
      "distance": "cosine",
  },
  "properties": [
        {
            "name": "title",
            "dataType": ["text"],
            "description": "HTML doc title.",
            "vectorizer": "text2vec-transformers",
            "moduleConfig": {
                "text2vec-transformers": {
                    "vectorizePropertyName": True,
                    "skip": False,
                    "tokenization": "lowercase"
                }
            },
            "invertedIndexConfig": {
                "bm25": {
                    "b": 0.75,
                    "k1": 1.2
                },
            }
        },
        {
            "name": "content",
            "dataType": ["text"],
            "description": "HTML page content.",
            "moduleConfig": {
                "text2vec-transformers": {
                    "vectorizePropertyName": True,
                    "tokenization": "whitespace"
                }
            }
        }
    ]  
}
wpCollection = client.collections.create_from_dict(class_obj)

logger.info("#### createChunksCollection() entered.")
if client.collections.exists("Chunks"):
    client.collections.delete("Chunks")

class_obj = {
    "class": "Chunks",
    "description": "Collection for document chunks.",
    "vectorizer": "text2vec-transformers",
    "moduleConfig": {
        "text2vec-transformers": {
            "vectorizeClassName": True
        }
    },
    "vectorIndexType": "hnsw",  
    "vectorIndexConfig": {
        "distance": "cosine",
    },
    "properties": [
        {
            "name": "chunk",
            "dataType": ["text"],
            "description": "Single webpage chunk.",
            "vectorizer": "text2vec-transformers",
            "moduleConfig": {
                "text2vec-transformers": {
                  "vectorizePropertyName": False,
                  "skip": False,
                  "tokenization": "lowercase"
                }
            }
        },
        {
            "name": "chunk_index",
            "dataType": ["int"]
        },
        {
            "name": "webpage",
            "dataType": ["Documents"],
            "description": "Webpage content chunks.",
        
            "invertedIndexConfig": {
                "bm25": {
                    "b": 0.75,
                    "k1": 1.2
                }
            }  
        }
    ]
}
wpChunkCollection = client.collections.create_from_dict(class_obj)


###########################################################
# Create document and chunks objects in the database.
logger.info("#### Create page/doc and chunk db objects.")
for i, className in enumerate(webpageDocNames):
    title = webpageTitles[i]
    logger.debug(f"## className, title: {className}, {title}")
    # Create Webpage Object
    page_content = page_contentArray[i]
    # Insert the document.
    wpCollectionObj_uuid = wpCollection.data.insert(
      {
        "name": className,
        "title": title,
        "content": page_content
      }
    )        
    
    # Insert the chunks for the document.
    for i2, chunk in enumerate(webpageChunks[i]):
        chunk_uuid = wpChunkCollection.data.insert(
          {
            "title": title,
            "chunk": chunk,
            "chunk_index": i2,
            "references":
            {
              "webpage": wpCollectionObj_uuid
            }
          }
        )

###############################################################################
# text contains prompt for vector DB.
text = "human-made computer cognitive ability"


###############################################################################
# Initial the the sentence transformer and encode the query prompt.
logger.info(f"#### Encode text query prompt to create vectors. {text}")
model = SentenceTransformer('/app/multi-qa-MiniLM-L6-cos-v1')

vector = model.encode(text)
vectorList = []

logger.debug("#### Print vectors.")
for vec in vector:
    vectorList.append(vec)
logger.debug(f"vectorList: {vectorList[2]}")

# Fetch chunks and print chunks.
logger.info("#### Retrieve semchunks from db using vectors from prompt.")
semChunks = wpChunkCollection.query.near_vector(
    near_vector=vectorList,
    distance=0.7,
    limit=3
)
logger.debug(f"### semChunks[0]: {semChunks}")

# Print chunks, corresponding document and document title.
logger.info("#### Print individual retrieved chunks.")
for chunk in enumerate(semChunks.objects):
    logger.info(f"#### chunk: {chunk}")
    webpage_uuid = chunk[1].properties['references']['webpage']
    logger.info(f"webpage_uuid: {webpage_uuid}")
    wpFromChunk = wpCollection.query.fetch_object_by_id(webpage_uuid)
    logger.info(f"### wpFromChunk title: {wpFromChunk.properties['title']}")

logger.info("#### Closing client db connection.")
client.close()

logger.info("#### Program terminating.")