Error on colab, with fastai2, @ learn.fit_one_cycle(4):

AttributeError: ‘NBMasterBar’ object has no attribute ‘out’
AttributeError: ‘NBMasterBar’ object has no attribute ‘start_t’

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@tunner007 The reason why upgrading doesn't help is that the interactive REPL prompt ignores the user's enviroment for its dependencies, so even after an upgrade it still uses the old version:

> !pip3 freeze | grep ipython
ipython==7.9.0
ipython-genutils==0.2.0
> print(IPython.version_info)
(5, 1, 0, '')

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I can't do anything to fix this without a reproducible example. If you have some code that generates this bug, it would be most helpful.

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I was just doing lesson 1 of the fast.ai course and got this error.

Even if this example does not reproduce the error for you, considering that self.out may not get initalized in every execution path, wouldn't cheking for self.out not being None before calling a method on it be a good safety measure?

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Doing lesson 1 of the fastai course is not a reproducible example as it runs completely fine for me and many other people, so there is another reason this fails for you. Adding a check of is not None is just going to make the progress bar not be shown so it's not really a solution.

fastai always beings the iteration of the master bar before adding a child, for some reason, creating the out attribute silently fails and returns None. What does

from IPython.display import clear_output, display, HTML
out = display(HTML(some_html_code), display_id=True)

do for you?

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Doing lesson 1 of the fastai course is not a reproducible example as it runs completely fine for me and many other people, so there is another reason this fails for you. Adding a check of is not None is just going to make the progress bar not be shown so it's not really a solution.

fastai always beings the iteration of the master bar before adding a child, for some reason, creating the out attribute silently fails and returns None. What does

from IPython.display import clear_output, display, HTML
out = display(HTML(some_html_code), display_id=True)

do for you?

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I think problem is with below code, in few cases of "ZMQInteractiveShell" ipython will not generate display_id due to which "out" becomes "None" & later it cannot update. For jupyter notebook it works fine but with cloudera i was facing this issue. So for my case i simply added a check if i am not able to generate display_id isnotebook becomes False which solves my problem.

I am noob here :P so will leave rest on you guys to clear it out.

def isnotebook():
    try:
        from google import colab
        return True
    except: pass
    try:
        shell = get_ipython().__class__.__name__
        if shell == 'ZMQInteractiveShell':
            ##added check here for display_id##
            return True   # Jupyter notebook, Spyder or qtconsole
        elif shell == 'TerminalInteractiveShell':
            return False  # Terminal running IPython
        else:
            return False  # Other type (?)
    except NameError:
        return False

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My experiences match the ones described by tunner007 (which is not surprising considering that our environments also seems to match). Displaying inline HTML works for me fine, both from data.show_batch (if I work around the downloading part) and also using the example code you pasted. However, out will be None in your example, which seems to indicate a bug in the environment instead of in fastprogress:

Because the bug seems to be elsewhere, I think you can safely close this issue (unless you see some trivial workaround, which may be worth adding).

Thanks to both of you for helping me find the real culprit.

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Ok. In this case we can add a test to see if a generated out becomes None inside isnotebook. That way, the progress bar will automatically revert to the console behavior for those enviromnents. Is this what you added @tunner007 ?

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s this

Yes... for me this solves the problem :)

Note: It seems to be a workaround cuz i was able to run the code but with no progress bar

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I continued my investigation and found that in the affected environment IPython is rather old:

pip3 freeze | grep ipython

ipython==5.1.0
ipython-genutils==0.2.0

I checked the source code of IPython as of this version and found that unlike recent versions, it does not return a display:

• old implementation
• new implementation

This seems to be the root cause of the problem.

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Ah ah, in that case a simple test of the ipython version should be enough. Do you know which version starts returning an output?

from fastprogress.

I continued my investigation and found that in the affected environment IPython is rather old:

pip3 freeze | grep ipython

ipython==5.1.0
ipython-genutils==0.2.0

I checked the source code of IPython as of this version and found that unlike recent versions, it does not return a display:

• old implementation
• new implementation

This seems to be the root cause of the problem.

Actually i even tried with latest version but faced same problem (versions tested ipython==7.4.0, ipython-7.9.0)

Can you please confirm if upgrading the version works for you ?

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It was added in this commit, and according to the tags listed at the top, it was first released in 6.0.0.

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@tunner007 The reason why upgrading doesn't help is that the interactive REPL prompt ignores the user's enviroment for its dependencies, so even after an upgrade it still uses the old version:

> !pip3 freeze | grep ipython
ipython==7.9.0
ipython-genutils==0.2.0
> print(IPython.version_info)
(5, 1, 0, '')

Got it !

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Added the test of IPython version, which should solve the issue. Thanks for your help investigating this bug!

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I'm trying to resume an epoch that was saved by the SaveModelCallback, by using start_epoch=1 but I get this error, Any solutions?

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Hello, I have run
from IPython.display import clear_output, display, HTML
out = display(HTML('

Testing

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