[Breaking] Migrate GPT4All to use PyGPT4All (#3934)

Seems the pyllamacpp package is no longer the supported bindings from
gpt4all. Tested that this works locally.

Given that the older models weren't very performant, I think it's better
to migrate now without trying to include a lot of try / except blocks

---------

Co-authored-by: Nissan Pow <npow@users.noreply.github.com>
Co-authored-by: Nissan Pow <pownissa@amazon.com>

docs/modules/models/llms/integrations/gpt4all.ipynb

@@ -27,7 +27,7 @@
                 }
             ],
             "source": [
-    "%pip install pyllamacpp > /dev/null"
+                "%pip install pygpt4all > /dev/null"
             ]
         },
         {
@@ -64,7 +64,7 @@
             "source": [
                 "### Specify Model\n",
                 "\n",
-    "To run locally, download a compatible ggml-formatted model. For more info, visit https://github.com/nomic-ai/pyllamacpp\n",
+                "To run locally, download a compatible ggml-formatted model. For more info, visit https://github.com/nomic-ai/pygpt4all\n",
                 "\n",
                 "For full installation instructions go [here](https://gpt4all.io/index.html).\n",
                 "\n",
@@ -79,7 +79,7 @@
             "metadata": {},
             "outputs": [],
             "source": [
-    "local_path = './models/gpt4all-lora-quantized-ggml.bin'  # replace with your desired local file path"
+                "local_path = './models/ggml-gpt4all-l13b-snoozy.bin'  # replace with your desired local file path"
             ]
         },
         {
@@ -102,8 +102,8 @@
                 "\n",
                 "# Path(local_path).parent.mkdir(parents=True, exist_ok=True)\n",
                 "\n",
-    "# # Example model. Check https://github.com/nomic-ai/pyllamacpp for the latest models.\n",
-    "# url = 'https://the-eye.eu/public/AI/models/nomic-ai/gpt4all/gpt4all-lora-quantized-ggml.bin'\n",
+                "# # Example model. Check https://github.com/nomic-ai/pygpt4all for the latest models.\n",
+                "# url = 'http://gpt4all.io/models/ggml-gpt4all-l13b-snoozy.bin'\n",
                 "\n",
                 "# # send a GET request to the URL to download the file. Stream since it's large\n",
                 "# response = requests.get(url, stream=True)\n",
@@ -165,7 +165,7 @@
             "name": "python",
             "nbconvert_exporter": "python",
             "pygments_lexer": "ipython3",
-   "version": "3.10.6"
+            "version": "3.11.2"
         }
     },
     "nbformat": 4,

langchain/llms/gpt4all.py

@@ -12,7 +12,7 @@ from langchain.llms.utils import enforce_stop_tokens
 class GPT4All(LLM):
     r"""Wrapper around GPT4All language models.
 
-    To use, you should have the ``pyllamacpp`` python package installed, the
+    To use, you should have the ``pygpt4all`` python package installed, the
     pre-trained model file, and the model's config information.
 
     Example:
@@ -126,19 +126,19 @@ class GPT4All(LLM):
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate that the python package exists in the environment."""
         try:
-            from pyllamacpp.model import Model as GPT4AllModel
+            from pygpt4all.models.gpt4all import GPT4All as GPT4AllModel
 
             llama_keys = cls._llama_param_names()
             model_kwargs = {k: v for k, v in values.items() if k in llama_keys}
             values["client"] = GPT4AllModel(
-                ggml_model=values["model"],
+                model_path=values["model"],
                 **model_kwargs,
             )
 
         except ImportError:
             raise ValueError(
-                "Could not import pyllamacpp python package. "
-                "Please install it with `pip install pyllamacpp`."
+                "Could not import pygpt4all python package. "
+                "Please install it with `pip install pygpt4all`."
             )
         return values
 

tests/integration_tests/llms/test_gpt4all.py

@@ -7,21 +7,12 @@ from langchain.llms import GPT4All
 
 
 def _download_model() -> str:
-    """Download model.
-    From https://the-eye.eu/public/AI/models/nomic-ai/gpt4all/gpt4all-lora-quantized.bin,
-    convert to new ggml format and return model path."""
-    model_url = "https://the-eye.eu/public/AI/models/nomic-ai/gpt4all/gpt4all-lora-quantized.bin"
-    tokenizer_url = "https://huggingface.co/decapoda-research/llama-7b-hf/resolve/main/tokenizer.model"
-    conversion_script = "https://github.com/nomic-ai/pyllamacpp/blob/main/pyllamacpp/scripts/convert_gpt4all.py"
+    """Download model."""
+    model_url = "http://gpt4all.io/models/ggml-gpt4all-l13b-snoozy.bin"
     local_filename = model_url.split("/")[-1]
 
-    if not os.path.exists("convert_gpt4all.py"):
-        urlretrieve(conversion_script, "convert_gpt4all.py")
-    if not os.path.exists("tokenizer.model"):
-        urlretrieve(tokenizer_url, "tokenizer.model")
     if not os.path.exists(local_filename):
         urlretrieve(model_url, local_filename)
-        os.system(f"python convert_gpt4all.py.py . tokenizer.model")
 
     return local_filename