[NEST Users] Re: Using nest server to run nestml models

Hello Pablo,

I apologize for the second mail.

I used wrong namespace of NEST Client because I looked into example file of NEST Client. I have already created PR to fix the wrong namespace in example.

it should be: ``` from nest_client import NESTClient nestsc = NESTClient() ...

```

Best Sebastian

On 1/15/25 01:13, Pablo Alejandro wrote:

Hi Everyone,

Apologies for sending the message below again. I think my last post was done incorrectly and no one got notifications.

---

Does nest server currently support nestml models? I couldn't find examples in the documentation (even though `nestml-server` binary exists in nest3.8 docker image). Ideally, I would like to run it with MPI too.

I can run a simple example (`python test.py`) with `nest-server` running from a docker container, but the same code fails if I use `nestml-server`:

``` docker run -it --rm -e LOCAL_USER_ID=`id -u $USER` -p 52425:52425 nest/nest-simulator:3.8 nest-server start ```

works, but

``` docker run -it --rm -e LOCAL_USER_ID=`id -u $USER` -p 52426:52426 nest/nest-simulator:3.8 nestml-server start ```

fails with

"/usr/local/lib/python3.10/dist-packages/urllib3/connection.py", line
199, in _new_conn sock = connection.create_connection( File
"/usr/local/lib/python3.10/dist-packages/urllib3/util/connection.py",
line 85, in create_connection raise err File
"/usr/local/lib/python3.10/dist-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
"/usr/local/lib/python3.10/dist-packages/urllib3/connectionpool.py",
line 789, in urlopen response = self._make_request( File
"/usr/local/lib/python3.10/dist-packages/urllib3/connectionpool.py",
line 495, in _make_request conn.request( File
"/usr/local/lib/python3.10/dist-packages/urllib3/connection.py", line
441, in request self.endheaders() File
"/usr/lib/python3.10/http/client.py", line 1278, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked) File
"/usr/lib/python3.10/http/client.py", line 1038, in _send_output
self.send(msg) File "/usr/lib/python3.10/http/client.py", line 976, in
send self.connect() File
"/usr/local/lib/python3.10/dist-packages/urllib3/connection.py", line
279, in connect self.sock = self._new_conn() File
"/usr/local/lib/python3.10/dist-packages/urllib3/connection.py", line
214, in _new_conn raise NewConnectionError(
urllib3.exceptions.NewConnectionError:
<urllib3.connection.HTTPConnection object at 0x7fb8b63ea440>: 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
"/usr/lib/python3/dist-packages/requests/adapters.py", line 439, in
send resp = conn.urlopen( File
"/usr/local/lib/python3.10/dist-packages/urllib3/connectionpool.py",
line 843, in urlopen retries = retries.increment( File
"/usr/local/lib/python3.10/dist-packages/urllib3/util/retry.py", line
519, in increment raise MaxRetryError(_pool, url, reason) from reason
# type: ignore[arg-type] urllib3.exceptions.MaxRetryError:
HTTPConnectionPool(host='localhost', port=52425): Max retries exceeded
with url: /exec (Caused by
NewConnectionError('<urllib3.connection.HTTPConnection object at
0x7fb8b63ea440>: 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
"/home/pablo/git/nest-client/test_server.py", line 4, in <module>
response = nsc.from_file('examples/NESTClient_script.py',
return_vars='n_events') File
"/home/pablo/git/nest-client/nest_client/nest_client.py", line 68, in
from_file return self.exec_script(script, return_vars) File
"/home/pablo/git/nest-client/nest_client/nest_client.py", line 56, in
exec_script response = requests.post <http://requests.post>(self.url +
'exec', json=params, headers=self.headers) File
"/usr/lib/python3/dist-packages/requests/api.py", line 119, in post
return request('post', url, data=data, json=json, **kwargs) File
"/usr/lib/python3/dist-packages/requests/api.py", line 61, in request
return session.request(method=method, url=url, **kwargs) File
"/usr/lib/python3/dist-packages/requests/sessions.py", line 544, in
request resp = self.send(prep, **send_kwargs) File
"/usr/lib/python3/dist-packages/requests/sessions.py", line 657, in
send r = adapter.send(request, **kwargs) File
"/usr/lib/python3/dist-packages/requests/adapters.py", line 516, in
send raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError:
HTTPConnectionPool(host='localhost', port=52425): Max retries exceeded
with url: /exec (Caused by
NewConnectionError('<urllib3.connection.HTTPConnection object at
0x7fb8b63ea440>: Failed to establish a new connection: [Errno 111]
Connection refused')) ```

The simple python code used is shown below. ``` from nest_client
import NESTClient nsc = NESTClient()

response = nsc.from_file('examples/NESTClient_script.py',
return_vars='n_events') n_events = response['data']

print('Number of events:', n_events) ```

No nestml models are being tested for now because I don't know which
functions should be used to generate code with `nest-client` e.g.

``` from pynestml.codegeneration.nest_code_generator_utils import
NESTCodeGeneratorUtils

module_name, neuron_model_name, synapse_model_name = \
NESTCodeGeneratorUtils.generate_code_for( "neuron.nestml",
"synapse.nestml", post_ports=["post_spikes"],
codegen_opts=codegen_opts ) ```

should be rewritten to use `from nest_client import NESTClient`.

Thanks in advance, Pablo Alejandro


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