ImageDataBunch is not defined

I am trying to install fastai in my windows 10.

My laptop has no GPU, I am using pip in cmd to install fastai.

In pip page(https://pypi.org/project/fastai/), they mentioned to install pytroch before installing fastai.

I followed that step,

For pytorch(https://pytorch.org/get-started/locally/)-

pip install torch==1.6.0+cpu torchvision==0.7.0+cpu -f https://download.pytorch.org/whl/torch_stable.html

Then, For fastai-

pip install fastai

These python packages are installed successfully.

from fastai.vision import *

This statement is imported fastai.vision successfully,

But when I use the ImageDataBunch function,

data = ImageDataBunch.from_folder(path, train=".", valid_pct=0.2, size=512, bs=4, seed=24)

It shows error, NameError: name ‘ImageDataBunch’ is not defined

I do not know what is happening, Could you please help me to solve this error, thanks

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The same issue as here Getting load_learner not defined

fastai is now in version 2
in version 2 there is no ImageDataBunch anymore, switch back to version 1 or migrate to version 2

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I am just copying from there notebook only. Why they have written it?

Yes, @Kornel, that is what I done finally, moved to version 1, working now, thanks

me too getting the same error. I have changed my fastai version2 to v1 but still getting the error. Can anyone please help me out!