我想创建一个虚拟环境，可以在其中使用 ollama 运行此 c.py。 （就像这个例子https://python.langchain.com/docs/integrations/llms/ollama）
c.py:
from langchain_community.llms import Ollama
llm = Ollama(model="llama2")
llm.invoke("Tell me a joke")
我用这个薄片创建了虚拟环境
{
description = "Python environment with ollama";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
inputs.flake-utils.url = "github:numtide/flake-utils";
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system:
let
pkgs = nixpkgs.legacyPackages.${system};
python = pkgs.python311;
ollama=pkgs.ollama;
Py = python.withPackages (ps: with ps; [
langchain
]);
in {
devShells.default = pkgs.mkShell {
buildInputs = [
ollama
Py
];
};
});
}
运行后环境似乎创建没有问题
nix develop但是当我尝试运行代码时，出现以下错误。
python c.py
Traceback (most recent call last): File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connection.py", line 203, in _new_conn
sock = connection.create_connection(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/util/connection.py", line 85, in create_connection
raise err File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/util/connection.py", line 73, in create_connection
sock.connect(sa) ConnectionRefusedError: [Errno 111] Connection refused
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connectionpool.py", line 790, in urlopen
response = self._make_request(
^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connectionpool.py", line 496, in _make_request
conn.request( File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connection.py", line 395, in request
self.endheaders() File "/nix/store/3v2ch16fkl50i85n05h5ckss8pxx6836-python3-3.11.8/lib/python3.11/http/client.py", line 1293, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked) File "/nix/store/3v2ch16fkl50i85n05h5ckss8pxx6836-python3-3.11.8/lib/python3.11/http/client.py", line 1052, in _send_output
self.send(msg) File "/nix/store/3v2ch16fkl50i85n05h5ckss8pxx6836-python3-3.11.8/lib/python3.11/http/client.py", line 990, in send
self.connect() File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connection.py", line 243, in connect
self.sock = self._new_conn()
^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connection.py", line 218, in _new_conn
raise NewConnectionError( urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7ffff4b1d510>: Failed to establish a new connection: [Errno 111] Connection refused
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/requests/adapters.py", line 486, in send
resp = conn.urlopen(
^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/connectionpool.py", line 844, in urlopen
retries = retries.increment(
^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/urllib3/util/retry.py", line 515, in increment
raise MaxRetryError(_pool, url, reason) from reason # type: ignore[arg-type]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=11434): Max retries exceeded with url: /api/generate (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7ffff4b1d510>: Failed to establish a new connection: [Errno 111] Connection refused'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last): File "/mnt/c/Users/Pierre-Olivier/Documents/python/llm/ollama/c.py", line 3, in <module>
llm.invoke("Tell me a joke") File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_core/language_models/llms.py", line 273, in invoke
self.generate_prompt( File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_core/language_models/llms.py", line 568, in generate_prompt
return self.generate(prompt_strings, stop=stop, callbacks=callbacks, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_core/language_models/llms.py", line 741, in generate
output = self._generate_helper(
^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_core/language_models/llms.py", line 605, in _generate_helper
raise e File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_core/language_models/llms.py", line 592, in _generate_helper
self._generate( File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_community/llms/ollama.py", line 408, in _generate
final_chunk = super()._stream_with_aggregation(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_community/llms/ollama.py", line 317, in _stream_with_aggregation
for stream_resp in self._create_generate_stream(prompt, stop, **kwargs): File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_community/llms/ollama.py", line 159, in _create_generate_stream
yield from self._create_stream(
^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/langchain_community/llms/ollama.py", line 220, in _create_stream
response = requests.post(
^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/requests/api.py", line 115, in post
return request("post", url, data=data, json=json, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/requests/api.py", line 59, in request
return session.request(method=method, url=url, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/requests/sessions.py", line 589, in request
resp = self.send(prep, **send_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/requests/sessions.py", line 703, in send
r = adapter.send(request, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/nix/store/rjh6glh0f6l27f893pknrg7p87ajhp65-python3-3.11.8-env/lib/python3.11/site-packages/requests/adapters.py", line 519, in send
raise ConnectionError(e, request=request) requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=11434): Max retries exceeded with url: /api/generate (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7ffff4b1d510>: Failed to establish a new connection: [Errno 111] Connection refused'))
这段代码可以工作，但可能还可以改进：
import subprocess
import atexit
ollama_server = subprocess.Popen(["ollama", "serve"])
atexit.register(ollama_server.terminate)
from langchain_community.chat_models import ChatOllama
from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate
llm = ChatOllama(model="mistral")
prompt = ChatPromptTemplate.from_template("compute {topic}")
chain = prompt | llm | StrOutputParser()
print(chain.invoke({"topic": "1+1"}))