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1		-(% class="wikigeneratedid" %)
2	2	== Jupyter notebook environment ("Lab") related ==
3	3
4	4	=== Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
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43	43
44	44
45	45
46		-== BrainScaleS specific ==
	45	+== BrainScaleS-2 specific ==
47	47
48	48	The [[BrainScaleS external user chat>>https://chat.bioai.eu/external-users/channels/town-square]] has service announcements (e.g. when a system is down due to maintenance) and is also a good place to ask general questions.
49	49
50		-(% class="wikigeneratedid" %)
51		-=== BrainScaleS-2 related ===
	49	+=== BrainScaleS-2 inhibitory synapse weights ===
52	52
53		-==== BrainScaleS-2 inhibitory synapse weights ====
54		-
55	55	21 October 2021: the pyNN version for BrainScaleS has been updated. Since then, inhibitory synapse weights need to negative numbers, otherwise the error message:
56	56
57	57	"pyNN.errors.ConnectionError: Weights must be negative for current-based, inhibitory synapses"
...	...	@@ -59,7 +59,7 @@
59	59	will be created (visibie in the .out file created by the job. In the notebook interface the error message can be, that the file needed for plotting is missing).
60	60
61	61
62		-==== BrainScaleS-2: "Job error" in the Collaboratory, though it worked until 21 June 2021 ====
	58	+=== BrainScaleS-2: "Job error" in the Collaboratory, though it worked until 21 June 2021 ===
63	63
64	64	On 21 June 2021 we changed the platform selection in the nmpi command client.submit_job(...,platform=nmpi.BRAINSCALES,...). From then on, please specify nmpi.BRAINSCALES**2** as the platform to run networks on the BrainScaleS-2 architecture (i.e. on "wafer">60).
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...	...	@@ -69,10 +69,12 @@
69	69
70	70	Also since 21 June 2021 a separate quota setting is used for BrainScaleS-2 (visible on the Quota tab in the JobManager)
71	71
72		-=== BrainScaleS-1 ===
	68	+== BrainScaleS-1 specific ==
73	73
74		-==== //PyMarocco.None// needs to be changed to //PyMarocco.Without// ====
	70	+The [[BrainScaleS external user chat>>https://chat.bioai.eu/external-users/channels/town-square]] has service announcements (e.g. when a system is down due to maintenance) and is also a good place to ask general questions.
75	75
	72	+=== //PyMarocco.None// needs to be changed to //PyMarocco.Without (Nov 2021)// ===
	73	+
76	76	November 2021: //marocco.backend = PyMarocco.None// had to be changed to //marocco.backend = PyMarocco.Without// due to the move to Python3, which has None as a reserved keyword. See also [[this FAQ entry in the guidebook>>https://electronicvisions.github.io/hbp-sp9-guidebook/pm/using_pm_newflow.html#rename-pymarocco-none-to-pymarocco-without]].
77	77
78	78	Symptom of the problem: In the .out file of the job execution, this error appears:
...	...	@@ -82,5 +82,6 @@
82	82	^
83	83	SyntaxError: invalid syntax}}}
84	84
	83	+Please find a [[working example script>>https://lab.ch.ebrains.eu/user-redirect/lab/tree/shared/NMC%20Collab%20copy%20template/BrainScaleS/BrainScaleS_01_Chain.ipynb]] in our [[copy-template Drive>>https://wiki.ebrains.eu/bin/view/Collabs/nmc-collab-copy-template/Drive]] (for copying into the users collab).
85	85
86	86	==== ====