updates not printed out

[DonGiulio]

hello,
I'm trying out simanneal, and found something that I don't understand:

here's my code:

oa = OptimizerAnnealer(strategy, ranges, self.get_data())
configuration, points = oa.anneal()

where my annealer is:

def __init__(self, strategy, ranges, data):
    self.strategy = strategy
    self.ranges = ranges
    self.data = data

    # initial state with first value of each range
    self.state = {}
    for key, value in self.ranges.items():
        self.state[key] = value[0]

    super(OptimizerAnnealer, self).__init__(self.state)  # important!

def move(self):
    key = pick(list(self.state))
    new_value = following(list(self.ranges[key]), self.state[key])
    self.state[key] = new_value

def energy(self):
   # energy function calculates points related to current state, obtaining a `result` float
   # that depends on state. 
    return result

the output of simanneal is:

Temperature        Energy    Accept   Improve     Elapsed   Remaining
 25000.00000        616.99                         0:00:02

and that's it, it doesn't show any updates at all. even though there are new solutions that have lower energy level.

anything I'm doing wrong?

Thanks

[perrygeo]

The frequency of printing is determined by the updates and steps properties. What does oa.steps and oa.updates give you?

[sanguinettib]

Somehow, the end="\r" in the print statement of the default update function seemed to prevent it from printing on my system (macOS mojave). Removing the end="\r' fixed the problem, at least for me.

[Iain-S]

@Br1000
There is a known issue with PyCharm where it won't print properly with end='\r' but will print strings containing '\r' just fine.

@perrygeo
Commit 2e79630 added end='\r' but I don't think it is necessary since the string begins with '\r' anyway. Perhaps it could be changed to end='' to help out PyCharm users?

Also, the annealing process seems to be run twice (once by auto and then again, for real). This leads to output like:

Temperature Energy Accept Improve Elapsed Remaining
Temperature Energy Accept Improve Elapsed Remaining
7.30000 6801.84 5.60% 0.27% 0:00:11 0:00:00

If you were to change

    print(' Temperature        Energy    Accept   Improve     Elapsed   Remaining',
                      file=sys.stderr)

to

    print('\n Temperature        Energy    Accept   Improve     Elapsed   Remaining',
                  file=sys.stderr) 

then the output would be:

empty line
Temperature Energy Accept Improve Elapsed Remaining
4.90000 6801.84 4.60% 0.00% 0:00:03 -1:59:59
Temperature Energy Accept Improve Elapsed Remaining
4.90000 6845.62 6.81% 0.14% 0:00:09 0:00:00
which I think is a bit neater.

[perrygeo]

@Iain-S sounds like a good solution. Would you mind creating a PR for it?