add ChatQnA instructions for AIPC (#356)

* Add readme for ChatQnA on AIPC

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: chen, suyue <[email protected]>

Author: 3 people

ChatQnA/docker/aipc/README.md

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+# Build Mega Service of ChatQnA on AIPC
+
+This document outlines the deployment process for a ChatQnA application utilizing the [GenAIComps](https://github.com/opea-project/GenAIComps.git) microservice pipeline on AIPC. The steps include Docker image creation, container deployment via Docker Compose, and service execution to integrate microservices such as `embedding`, `retriever`, `rerank`, and `llm`.
+
+## 🚀 Build Docker Images
+
+First of all, you need to build Docker Images locally and install the python package of it.
+
+```bash
+git clone https://github.com/opea-project/GenAIComps.git
+cd GenAIComps
+```
+
+### 1. Build Embedding Image
+
+```bash
+docker build --no-cache -t opea/embedding-tei:latest -f comps/embeddings/langchain/docker/Dockerfile .
+```
+
+### 2. Build Retriever Image
+
+```bash
+docker build --no-cache -t opea/retriever-redis:latest -f comps/retrievers/langchain/redis/docker/Dockerfile .
+```
+
+### 3. Build Rerank Image
+
+```bash
+docker build --no-cache -t opea/reranking-tei:latest -f comps/reranks/langchain/docker/Dockerfile .
+```
+
+### 4. Build LLM Image
+
+We use [Ollama](https://ollama.com/) as our LLM service for AIPC. Please pre-download Ollama on your PC.
+
+```bash
+docker build --no-cache -t opea/llm-ollama:latest -f comps/llms/text-generation/ollama/Dockerfile .
+```
+
+### 5. Build Dataprep Image
+
+```bash
+docker build --no-cache -t opea/dataprep-redis:latest -f comps/dataprep/redis/langchain/docker/Dockerfile .
+cd ..
+```
+
+### 6. Build MegaService Docker Image
+
+To construct the Mega Service, we utilize the [GenAIComps](https://github.com/opea-project/GenAIComps.git) microservice pipeline within the `chatqna.py` Python script. Build MegaService Docker image via below command:
+
+```bash
+git clone https://github.com/opea-project/GenAIExamples.git
+cd GenAIExamples/ChatQnA/docker
+docker build --no-cache -t opea/chatqna:latest -f Dockerfile .
+cd ../../..
+```
+
+### 7. Build UI Docker Image
+
+Build frontend Docker image via below command:
+
+```bash
+cd GenAIExamples/ChatQnA/docker/ui/
+docker build --no-cache -t opea/chatqna-ui:latest -f ./docker/Dockerfile .
+cd ../../../..
+```
+
+Then run the command `docker images`, you will have the following 7 Docker Images:
+
+1. `opea/dataprep-redis:latest`
+2. `opea/embedding-tei:latest`
+3. `opea/retriever-redis:latest`
+4. `opea/reranking-tei:latest`
+5. `opea/llm-ollama:latest`
+6. `opea/chatqna:latest`
+7. `opea/chatqna-ui:latest`
+
+## 🚀 Start Microservices
+
+### Setup Environment Variables
+
+Since the `docker_compose.yaml` will consume some environment variables, you need to setup them in advance as below.
+
+**Export the value of the public IP address of your AIPC to the `host_ip` environment variable**
+
+> Change the External_Public_IP below with the actual IPV4 value
+
+```
+export host_ip="External_Public_IP"
+```
+
+For Linux users, please run `hostname -I | awk '{print $1}'`. For Windows users, please run `ipconfig | findstr /i "IPv4"` to get the external public ip.
+
+**Export the value of your Huggingface API token to the `your_hf_api_token` environment variable**
+
+> Change the Your_Huggingface_API_Token below with tyour actual Huggingface API Token value
+
+```
+export your_hf_api_token="Your_Huggingface_API_Token"
+```
+
+**Append the value of the public IP address to the no_proxy list**
+
+```
+export your_no_proxy=${your_no_proxy},"External_Public_IP"
+```
+
+```bash
+export no_proxy=${your_no_proxy}
+export http_proxy=${your_http_proxy}
+export https_proxy=${your_http_proxy}
+export EMBEDDING_MODEL_ID="BAAI/bge-base-en-v1.5"
+export RERANK_MODEL_ID="BAAI/bge-reranker-base"
+export TEI_EMBEDDING_ENDPOINT="http://${host_ip}:6006"
+export TEI_RERANKING_ENDPOINT="http://${host_ip}:8808"
+export REDIS_URL="redis://${host_ip}:6379"
+export INDEX_NAME="rag-redis"
+export HUGGINGFACEHUB_API_TOKEN=${your_hf_api_token}
+export MEGA_SERVICE_HOST_IP=${host_ip}
+export EMBEDDING_SERVICE_HOST_IP=${host_ip}
+export RETRIEVER_SERVICE_HOST_IP=${host_ip}
+export RERANK_SERVICE_HOST_IP=${host_ip}
+export LLM_SERVICE_HOST_IP=${host_ip}
+export BACKEND_SERVICE_ENDPOINT="http://${host_ip}:8888/v1/chatqna"
+export DATAPREP_SERVICE_ENDPOINT="http://${host_ip}:6007/v1/dataprep"
+
+export OLLAMA_ENDPOINT=http://${host_ip}:11434
+# On Windows PC, please use host.docker.internal instead of ${host_ip}
+#export OLLAMA_ENDPOINT=http://host.docker.internal:11434
+```
+
+Note: Please replace with `host_ip` with you external IP address, do not use localhost.
+
+### Start all the services Docker Containers
+
+> Before running the docker compose command, you need to be in the folder that has the docker compose yaml file
+
+```bash
+cd GenAIExamples/ChatQnA/docker/aipc/
+docker compose -f docker_compose.yaml up -d
+
+# let ollama service runs
+ollama run llama3
+```
+
+### Validate Microservices
+
+1. TEI Embedding Service
+
+```bash
+curl ${host_ip}:6006/embed \
+    -X POST \
+    -d '{"inputs":"What is Deep Learning?"}' \
+    -H 'Content-Type: application/json'
+```
+
+2. Embedding Microservice
+
+```bash
+curl http://${host_ip}:6000/v1/embeddings\
+  -X POST \
+  -d '{"text":"hello"}' \
+  -H 'Content-Type: application/json'
+```
+
+3. Retriever Microservice  
+   To validate the retriever microservice, you need to generate a mock embedding vector of length 768 in Python script:
+
+```bash
+your_embedding=$(python3 -c "import random; embedding = [random.uniform(-1, 1) for _ in range(768)]; print(embedding)")
+curl http://${host_ip}:7000/v1/retrieval \
+  -X POST \
+  -d '{"text":"What is the revenue of Nike in 2023?","embedding":"'"${your_embedding}"'"}' \
+  -H 'Content-Type: application/json'
+```
+
+4. TEI Reranking Service
+
+```bash
+curl http://${host_ip}:8808/rerank \
+    -X POST \
+    -d '{"query":"What is Deep Learning?", "texts": ["Deep Learning is not...", "Deep learning is..."]}' \
+    -H 'Content-Type: application/json'
+```
+
+5. Reranking Microservice
+
+```bash
+curl http://${host_ip}:8000/v1/reranking\
+  -X POST \
+  -d '{"initial_query":"What is Deep Learning?", "retrieved_docs": [{"text":"Deep Learning is not..."}, {"text":"Deep learning is..."}]}' \
+  -H 'Content-Type: application/json'
+```
+
+6. Ollama Service
+
+```bash
+curl http://${host_ip}:11434/api/generate -d '{"model": "llama3", "prompt":"What is Deep Learning?"}'
+```
+
+7. LLM Microservice
+
+```bash
+curl http://${host_ip}:9000/v1/chat/completions\
+  -X POST \
+  -d '{"query":"What is Deep Learning?","max_new_tokens":17,"top_k":10,"top_p":0.95,"typical_p":0.95,"temperature":0.01,"repetition_penalty":1.03,"streaming":true}' \
+  -H 'Content-Type: application/json'
+```
+
+8. MegaService
+
+```bash
+curl http://${host_ip}:8888/v1/chatqna -H "Content-Type: application/json" -d '{
+     "messages": "What is the revenue of Nike in 2023?"
+     }'
+```
+
+9. Dataprep Microservice（Optional）
+
+If you want to update the default knowledge base, you can use the following commands:
+
+Update Knowledge Base via Local File Upload:
+
+```bash
+curl -X POST "http://${host_ip}:6007/v1/dataprep" \
+     -H "Content-Type: multipart/form-data" \
+     -F "files=@./nke-10k-2023.pdf"
+```
+
+This command updates a knowledge base by uploading a local file for processing. Update the file path according to your environment.
+
+Add Knowledge Base via HTTP Links:
+
+```bash
+curl -X POST "http://${host_ip}:6007/v1/dataprep" \
+     -H "Content-Type: multipart/form-data" \
+     -F 'link_list=["https://opea.dev"]'
+```
+
+This command updates a knowledge base by submitting a list of HTTP links for processing.
+
+## 🚀 Launch the UI
+
+To access the frontend, open the following URL in your browser: http://{host_ip}:5173.