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1	1	(% class="wikigeneratedid" %)
2		-(Test sentence)
	2	+== Jupyter notebook environment ("Lab") related ==
3	3
4		-== Problems with the Jupyter notebook environment ("Lab") ==
5		-
6	6	=== Error message "Error in Authenticator.pre_spawn_start: ... 401: Unauthorized" ===
7	7
8	8	When a new user accesses the Lab in a new collab for the first time, it is possible, that the JuypterLab is not starting and instead shows a "...401 Unauthorized" message.
...	...	@@ -40,22 +40,27 @@
40	40	Via choosing a different lab execution site it is be possible to choose a specific site, if there are specific needs for the created Jupyter virtual machine for a given task (e.g. a large memory requirement). Currently all the examples do not need any site specific features, so you can select in principle any site. BUT (as of end of August 21) there is a sporadic problem with the NMPI communication, if running at Jülich. Thus for now, please use CSCS as the primary execution site.
41	41
42	42
43		-=== BrainScaleS-2 inhibitory synapse weights ===
	41	+=== ===
44	44
45		-21 October 2021: the pyNN version for BrainScaleS has been updated. Since then, inhibitory synapse weights need to negative numbers, otherwise the error message:
46	46
47		- "pyNN.errors.ConnectionError: Weights must be negative for current-based, inhibitory synapses"
48	48
49		-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).
50	50
	46	+== BrainScaleS specific ==
51	51
	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.
52	52
53		-
	50	+(% class="wikigeneratedid" %)
	51	+=== BrainScaleS-2 related ===
54	54
55		-== BrainScaleS specific tips ==
	53	+==== BrainScaleS-2 inhibitory synapse weights ====
56	56
57		-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.
	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:
58	58
	57	+ "pyNN.errors.ConnectionError: Weights must be negative for current-based, inhibitory synapses"
	58	+
	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	+
	61	+
59	59	==== BrainScaleS-2: "Job error" in the Collaboratory, though it worked until 21 June 2021 ====
60	60
61	61	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).
...	...	@@ -68,7 +68,16 @@
68	68
69	69	=== BrainScaleS-1 ===
70	70
71		-Currently (2 July 2021) the default-system ("wafer 33") is under maintenance. Please see the [[BrainScaleS-1 chat>>https://chat.bioai.eu/external-users/channels/brainscales]] for updates.
	74	+==== //PyMarocco.None// needs to be changed to //PyMarocco.Without// ====
72	72
	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]].
73	73
74		-==== ====
	78	+Symptom of the problem: In the .out file of the job execution, this error appears:
	79	+
	80	+{{{ File "run.py", line ...
	81	+ marocco.backend = PyMarocco.None
	82	+ ^
	83	+SyntaxError: invalid syntax}}}
	84	+
	85	+
	86	+==== ====