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[SageManifolds] Error : Black hole rendering with SageMath

asked 2023-11-13 18:04:45 +0200

wookhwi gravatar image

updated 2023-11-21 11:21:18 +0200

FrédéricC gravatar image

HI! I, Jaekwook Lee, am a graduate student at Chungbuk National university, Korea, and am currently working on particle trajectory around black holes.

The error source is SageManifolds / Notebooks / Image of an accretion disk around a Schwarzschild black hole. (Black hole rendering with SageMath / Florentin Jaffredo) [ link ]

I'm trying to draw the trajectory around the black hole using Sagemath on above code, but I'm asking because I've been getting code errors.

The error occur in Cell Number [28].

Below is the error message

Process SpawnPoolWorker-1:
Traceback (most recent call last):
Process SpawnPoolWorker-2:
Traceback (most recent call last):
Process SpawnPoolWorker-3:
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-4:
Process SpawnPoolWorker-5:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-6:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-8:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-7:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-9:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-10:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-11:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-12:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-13:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-14:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-15:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-16:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-17:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-18:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-19:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-20:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-21:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-22:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-23:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-24:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
Process SpawnPoolWorker-25:
Traceback (most recent call last):
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/pool.py", line 114, in worker
    task = get()
           ^^^^^
  File "/private/var/tmp/sage-10.1-current/local/var/lib/sage/venv-python3.11.1/lib/python3.11/multiprocessing/queues.py", line 367, in get
    return _ForkingPickler.loads(res)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: Can't get attribute 'calc_some_geodesics' on <module '__main__' (built-in)>
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answered 2023-11-13 21:50:36 +0200

eric_g gravatar image

updated 2023-11-15 15:28:31 +0200

The notebook (as posted at https://github.com/sagemanifolds/Sage...) works well for me with SageMath 10.1 on Ubuntu 22.04.

It seems that you are facing some parallelization issue. Have you tried to run the cell 29 instead of 28 as suggested in the notebook?

Update (15 Nov. 2023):

The error might be due to the memory limit of your CoCalc account. I've tried the same notebook (with parallelization) on my CoCalc account with 4 GB memory and with SageMath 10.0 kernel (due to the issue https://ask.sagemath.org/question/74323) and the notebook runs nicely. If you cannot increase the memory on your CoCalc account, consider lowering the resolution by selecting the following cell at the beginning of the notebook:

n_cpu = 4
n_geod = 100
nx, ny = 180, 90
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If I use cell 29 as suggested in the notebook, the error occur.

NameError Traceback (most recent call last) Cell In [26], line 1 ----> 1 geo = calc_some_geodesics((c, Integer(0), n_geod)) 3 pool = multiprocessing.Pool(n_cpu) 5 # progress bar display NameError: name 'c' is not defined

wookhwi gravatar imagewookhwi ( 2023-11-14 10:19:53 +0200 )edit

You have to adapt cell 29 to something that does the same thing as cell 28 but on a single process, like

geo = {}
for arg in args:
    some_res = calc_some_geodesics(arg)
    geo.update(some_res)

I have updated the notebook to include this.

eric_g gravatar imageeric_g ( 2023-11-14 12:11:09 +0200 )edit

Thank you very much for your reply! I executed the code as below and it worked well.

[1]

geo = {}
for arg in args:
    some_res = calc_some_geodesics(arg)
    geo.update(some_res)

%display plain
f = FloatProgress(min=0, max=n_geod)

[2]

display(f)
for arg in args:
    some_res = calc_some_geodesics(arg) 
    f.value += len(some_res)
    geo.update(some_res)
wookhwi gravatar imagewookhwi ( 2023-11-14 16:42:18 +0200 )edit

I've updated my answer to point out the memory issue on CoCalc.

eric_g gravatar imageeric_g ( 2023-11-15 15:30:36 +0200 )edit
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Asked: 2023-11-13 18:04:45 +0200

Seen: 198 times

Last updated: Nov 15 '23

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