Re: Multiple incompatible subclass instances of TerminalInteractiveShell

Ok, it seems to be related to this import

from ipdb import set_trace

(just import, not calling set_trace)

Best,
Florian

Am 24.03.2017 um 15:04 schrieb Florian Lindner:
> Hello,
> 
> from my ipyparallel application I get this error:
> 
> Multiple incompatible subclass instances of TerminalInteractiveShell are being created.
> 
> (complete traceback below)
> 
> System is Arch Linux, ipython-ipyparallel 6.0.2.
> 
> The ipcluster was started in the same directory in which also the client was started.
> 
> What I do is basically:
> 
> rc = ipp.Client()
> lview = rc.load_balanced_view()
> dview = rc[:]
> dview.use_cloudpickle()
> dview.execute("import numpy as np")
> dview.execute("import RBF")
> dview.push({"SeparatedConsistent" : SeparatedConsistent})
> 
> # BFs is a list of functions
> separated = lview.map(lambda x: SeparatedConsistent(x, in_mesh, in_vals), BFs)
> separated.wait()
> 
> # This works, as a serial alternative:
> # separated = [SeparatedConsistent(x, in_mesh, in_vals) for x in BFs]
> 
> # The exception happens here
> ax1.semilogy(ms, [i.RMSE(func, test_mesh) for i in separated], "--", label = "RMSE")
> 
> 
> Sorry for being able to present only applications fragments.
> 
> What could cause this error message? Google turned up nothing helpful.
> 
> Best Thanks,
> Florian
> 
> 
> Traceback (most recent call last):
>   File "parallel.py", line 57, in <module>
>     main()
>   File "parallel.py", line 53, in main
>     plot_shape_parameters()
>   File "parallel.py", line 26, in plot_shape_parameters
>     ax1.semilogy(ms, [i.RMSE(func, test_mesh) for i in separated], "--", label = "RMSE")
>   File "parallel.py", line 26, in <listcomp>
>     ax1.semilogy(ms, [i.RMSE(func, test_mesh) for i in separated], "--", label = "RMSE")
>   File "/usr/lib/python3.6/site-packages/ipyparallel/client/asyncresult.py", line 673, in __iter__
>     for r in it():
>   File "/usr/lib/python3.6/site-packages/ipyparallel/client/asyncresult.py", line 692, in _ordered_iter
>     rlist = self.get(0)
>   File "/usr/lib/python3.6/site-packages/ipyparallel/client/asyncresult.py", line 167, in get
>     raise self.exception()
>   File "/usr/lib/python3.6/site-packages/ipyparallel/client/asyncresult.py", line 226, in _resolve_result
>     results = error.collect_exceptions(results, self._fname)
>   File "/usr/lib/python3.6/site-packages/ipyparallel/error.py", line 233, in collect_exceptions
>     raise e
>   File "/usr/lib/python3.6/site-packages/ipyparallel/error.py", line 231, in collect_exceptions
>     raise CompositeError(msg, elist)
> ipyparallel.error.CompositeError: one or more exceptions from call to method: <lambda>
> [0:apply]: MultipleInstanceError: Multiple incompatible subclass instances of TerminalInteractiveShell are being created.
> [2:apply]: MultipleInstanceError: Multiple incompatible subclass instances of TerminalInteractiveShell are being created.
> [3:apply]: MultipleInstanceError: Multiple incompatible subclass instances of TerminalInteractiveShell are being created.
> [1:apply]: MultipleInstanceError: Multiple incompatible subclass instances of TerminalInteractiveShell are being created.
> .... 46 more exceptions ...
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