chromadb-client

Ensure the ChromaDB server is running and accessible from your client. If running locally, start the server; if remote, verify the host, port, and network connectivity (e.g., firewalls). 

Example (running a local server via Docker for HTTP client):
```python
import chromadb

# Ensure ChromaDB server is running, e.g., via Docker:
# docker run -p 8000:8000 chromadb/chroma

client = chromadb.HttpClient(host='localhost', port=8000)
print(client.heartbeat())
```

Instantiate and pass an embedding function (e.g., from `chromadb.utils.embedding_functions` or a custom one) when creating or getting a collection.
```python
import chromadb
from chromadb.utils import embedding_functions

client = chromadb.HttpClient(host='localhost', port=8000) # Or PersistentClient if using the full chromadb package

# Using a Sentence Transformer embedding function
sentence_transformer_ef = embedding_functions.SentenceTransformerEmbeddingFunction(model_name="all-MiniLM-L6-v2")

collection = client.get_or_create_collection(
    name="my_collection", 
    embedding_function=sentence_transformer_ef
)

collection.add(documents=["This is a test document"], metadatas=[{"source": "my_doc"}], ids=["doc1"])
```

If you intend to use the full ChromaDB server functionalities (including local persistence), ensure you install the complete `chromadb` package, not just `chromadb-client`. If you only need the HTTP client, import `chromadb.HttpClient` directly or ensure that `chromadb` (the full package) is installed if other libraries implicitly require it.

To install the full `chromadb` package:
`pip install chromadb`

Then, for an HTTP client:
```python
import chromadb # This would now refer to the full package which includes HttpClient
client = chromadb.HttpClient(host='localhost', port=8000)
```

If you only have `chromadb-client` installed and specifically want the client, ensure you import correctly:
```python
import chromadb.api.segment # Example of a valid import within chromadb-client
from chromadb.api.segment import API # Or chromadb.HttpClient

# Note: chromadb-client does not expose chromadb.Client() directly for a local client.
# You would typically use chromadb.HttpClient.
```

To use `PersistentClient`, you must install the full `chromadb` package instead of `chromadb-client`. The `chromadb-client` is designed for remote interactions with a running ChromaDB server.

Install the full `chromadb` package:
`pip install chromadb`

Then, use `PersistentClient`:
```python
import chromadb

client = chromadb.PersistentClient(path="./my_chroma_db")
collection = client.get_or_create_collection(name="my_persistent_collection")
```

If you intended to use an HTTP client with `chromadb-client`, use `chromadb.HttpClient`:
```python
import chromadb

client = chromadb.HttpClient(host='localhost', port=8000) # Assumes a ChromaDB server is running
collection = client.get_or_create_collection(name="my_http_collection")
```