Machine Learning

jmv38

hello
v08: added a white image and a random image should return 0: to improve robustness
https://gist.github.com/d21c832208f33fe083b9200b29e1f073

Matteo

@jmv38 Hi interesting project! I'd like to ask you two things about it:

could you easly modify your script in order to allow execution also on little screens (4 in)? Does anyone here (Pythonista forum) know a general way to modify easly a script with UI in order to adapt it automatically according to screen size (through the automatic recognition of the screen size of the device where the script is executed)?
only for fun, if you are interested: how about a script (by following your original script) that tries to learn to play tic-tac-toe game? For example with random choice of moves at beginning and positive weight to set of moves for winner player in several matches, in order to create a set of moves (getting closer to being the best ones) for each situation? What would you suggest?

Thank you and feel free to share some reasoning about it.
Regards

jmv38

@Matteo hello.
Note that mkeywood made the original programm and ui layout. I just made a set of small changes each time that lead me here.
For you questions:
1/ the ui part is at the bottom of the script. You can change the numbers and the layout to match your screen definition. That is some work though (1 hour or less).
2/ that would be quite some thinking to do that. For the moment i am just doing simple things to learn python, by tweaking mkeywood programm, so it is beyond me.
Thanks.

Matteo

@jmv38 Oops, you are right , my mistake, sorry @mkeywood :-), I didn't read the whole thread...

Anyway thank you for the answer. Some times ago I started for fun to study something about ML, and the first test example in my mind was an algorithm able to learn how to play a simple game like tictactoe, without studying any python specific library for ML.

The interesting thing in my opinion is how to create a general algorithm able to learn something without any big python libraries, only as a concept proof and with some little constraints defined by user for the research of the Ml goal/goals. The constraints could change in the algorithm when some situations occur during calculation. So thank you again both for your work, maybe it could give me some technical info for the ML game solver I've in mind.

Regards

jmv38

v09:
1/ cleaned up some code
2/ live color feedback during training on samples
https://gist.github.com/89684d9166746504bba88348240e26ff

jmv38

v10: 1/ added a [learn more] button to ... learn more.
https://gist.github.com/f7fc75b727c953e4dbb59c04f88acf74

mkeywood

@jmv38, looks like some great updates. I look forward to looking over them this weekend :)

@Matteo, no problem at all. @jmv38 has built on it massively from what I did. Really this is here for anyone to enjoy.

Thanks

jmv38

Please help wanted!
I am stuck on a bug and i cant find what i am doing wrong.
here is the gist https://gist.github.com/3af5cf10e59944648ee38d3628282324
it runs fine. But i have tried to move a small piece of code to a class and then i crash all the time. no idea what is wrong.
To see the bug happen, replace False by True in this line 294

    testBug = False # set True to show the bug

with False i directly execute the code, with True i use the piece embedded in the SketchView class.
the problem seems to appear when i ask the SketchView instance to remember an image: line 230

self.sImage = pil_image

can anyone help me?
thanks

mikael

@jmv38, if Pythonista crashes, google for ”dgelessus faulthandler” to get the ObjC exception. If it is not a Pythonista crash, what is the trace?

jmv38

it is a pythonista crash

jmv38

note that the images stored are very small (25x25) and only 3 SketchView objects are using them. So it cannot be memory overflow.
I am probably doing something very wrong somewhere, but what?
What is puzzling is that the very same code, executed 200 times works fine. I try to execute it only 3 times, and re-use the result, but then it does not work...
Note that it works the 1rst time. This code never crashes

  def run(self):
    global X, y, pts, NN
    n = len(self.vars)
    count = self.count
    if count<n:
      if count == 3: exit()

the crash occurs ramdomly during one of the next calls. Not always the same. I must be writing in the memory at a wrong place.

cvp

Crash, with faulthandler, gives an empty faultlog-temp.txt...strange

cvp

@jmv38 Not sure if that helps but no crash with

  def getImg(self):
    if self.sImage == None:
      pil_image = ui2pil(snapshot(self.subviews[0]))
      _,_,_,pil_image = pil_image.split()
      pil_image = pil_image.resize((100, 100),PILImage.BILINEAR)
      pil_image = pil_image.resize((50, 50),PILImage.BILINEAR)
      pil_image = pil_image.resize((25, 25),PILImage.BILINEAR)
      return pil_image.copy() <-------------------
      self.sImage = pil_image
    return self.sImage.copy()

jmv38

@cvp thank you, i feel less alone...
your last proposal is not a solution to the problem: the sImage is never updated, so it is recomputed at each cycle, that is what want to avoid.
I just tried some more changes (slow down, predefine self.sImage), but nothing works.
Must be something stupid (a bad local name, messing with a global?). Or are the some memory bugs in pythonista?
I think i must be degrading self.sImage, but how? i return a copy, not the image itself, and i dont modify sketch[] during learning...

cvp

@jmv38 this shows, on my iPad mini 4, that crash arrives after preparing 71/243

    if testBug:
      pil_image = v.getImg()
      time.sleep(0.05)

Preparing 74/243... .....always 74 even with time.sleep(0.5)

cvp

@jmv38 Not sure if this modification does destroy the algorithm

in updateLearninImage

  BWlearningSetImage = temp#.convert('RGB')

in showTraining

    global BWlearningSetImage
    BWlearningSetImage = BWlearningSetImage.convert('RGB')

jmv38

@cvp does it solve the bug?

jmv38

@cvp no crash, you are right!
Incredible that you found that.
Any insight of what is going on there?

jmv38

@cvp thank you so much for solving my problem!
I wish i understood what was wrong in my code, though...

cvp

@jmv38 I'm just happy to have been able to help.
Sincerely, I don't understand all your code but I've tried to follow it, step by step by skipping some process until I found this "solution". I agree that it does not explain the problem

Doing the conversion at end is less work, I think, because not converted at each iteration.
Perhaps, a problem of cpu consumption