dwave-examples / nurse-scheduling Goto Github PK

Hi,
When I run python nurse_scheduling.py, following error occurred:

Traceback (most recent call last):
File "nurse_scheduling.py", line 166, in
sampler = LeapHybridSampler()
File "/Users/jinzhe/opt/anaconda3/lib/python3.8/site-packages/dwave/system/samplers/leap_hybrid_sampler.py", line 97, in init
self.client = Client.from_config(
File "/Users/jinzhe/opt/anaconda3/lib/python3.8/site-packages/dwave/cloud/client.py", line 344, in from_config
return _clients_client
File "/Users/jinzhe/opt/anaconda3/lib/python3.8/site-packages/dwave/cloud/client.py", line 386, in init
raise ValueError("API token not defined")
ValueError: API token not defined

I installed dwave with pip install dwave-system.
Could you help me?
Thanks,

I refer to both the hard shift and soft nurse constraint.

In doing my algebra, I wasn't able to reproduce the exact equation found in the documentations for both constraints.
I think I may have gotten rusty at my high school math but please look at the following and enlighten me:

Mine: Expanding the following equation and removing the constant:

    lagrange_hard_shift * sum_d ( effort * sum_n q_i(n,d) - workforce ) ** 2

gives me the following:

    lagrange_hard_shift * effort ** 2 * sum_d sum_m sum_n q_i(n,d) q_j(m, d)   (Similar)
    - 2 * lagrange_hard_shift * sum_d sum_n q_i(n,d) * effort * workforce   (Different)

Documentation: Notice the (Different) parts - above vs the bottom one:

    lagrange_hard_shift * (effort ** 2 - 2 effort * workforce) * sum_d sum_n q_i(n,d)   (Different)
    + lagrange_hard_shift * effort ** 2 * sum_d sum_m sum_n q_i(n,d) q_j(m, d)    (Similar)

There is an additional effort **2 among other things. Can someone please kindly explain the differences?
Thanks