Read ipywidget user value if the main thread is blocked by loop

[Attila Bagoly]

Hi!

I'm working on interactive interface (using ipywidgets) for a machine learning library in jupyter. I have a function with a big loop (training loop) which blocks the main thread (I can't put this loop to a different thread) and therefore I can't interact with server during the training.

I made a simple example:

from time import sleep
from ipywidgets import widgets
from IPython.display import display


fs = widgets.FloatSlider(max=100, value=0)
display(fs)
for i in range(10):
    display(fs.value)
    sleep(1)

Here I won't see the change in fs.value until the loop ended. How can I force IPython to synchronize the fs.value in every iteration?

Attila

[Hai Nguyen]

you can try this

# 1st cell

import ipywidgets

fslider = ipywidgets.FloatSlider(max=10, min=0)

fslider

# 2nd cell

import time

for i in range(8):

    fslider.value = i

    time.sleep(0.2)

Hai

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[Attila Bagoly]

In this direction works even if everything is in same cell. But what I need is reading the value in the for loop, and if I changed the value in javascript I want to see it. 

In that example I'm just displaying the value of slider. If you move the slider during the loop, the fs.value won't change. This is my problem.