Error running the 10_tutorial.pets notebook from fastai2 tutorials

fastai fastai dev
1

I am running the 10_tutorial.pets notebook from the fastai2’s dev folder to understand the dataloaders. When I create the DataLoaders from the TfmdLists, I got the following error.

The error is attached below… Please enlighten me on this…

splits = RandomSplitter(seed=42)(items)
tls = TfmdLists(items, [Resize(224), PetTfm(), FlipItem(p=0.5), ToTensor()], splits=splits)

dls = tls.dataloaders(bs=64)
dls.show_batch()

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-78-90634fcc3c9e> in <module>
----> 1 dls.show_batch()

~/.local/lib/python3.6/site-packages/fastai2/data/core.py in show_batch(self, b, max_n, ctxs, show, unique, **kwargs)
     93         if b is None: b = self.one_batch()
     94         if not show: return self._pre_show_batch(b, max_n=max_n)
---> 95         show_batch(*self._pre_show_batch(b, max_n=max_n), ctxs=ctxs, max_n=max_n, **kwargs)
     96         if unique: self.get_idxs = old_get_idxs
     97 

~/.local/lib/python3.6/site-packages/fastcore/dispatch.py in __call__(self, *args, **kwargs)
     96         if not f: return args[0]
     97         if self.inst is not None: f = MethodType(f, self.inst)
---> 98         return f(*args, **kwargs)
     99 
    100     def __get__(self, inst, owner):

~/.local/lib/python3.6/site-packages/fastai2/vision/data.py in show_batch(x, y, samples, ctxs, max_n, nrows, ncols, figsize, **kwargs)
     43 def show_batch(x:TensorImage, y, samples, ctxs=None, max_n=10, nrows=None, ncols=None, figsize=None, **kwargs):
     44     if ctxs is None: ctxs = get_grid(min(len(samples), max_n), nrows=nrows, ncols=ncols, figsize=figsize)
---> 45     ctxs = show_batch[object](x, y, samples, ctxs=ctxs, max_n=max_n, **kwargs)
     46     return ctxs
     47 

~/.local/lib/python3.6/site-packages/fastai2/data/core.py in show_batch(x, y, samples, ctxs, max_n, **kwargs)
     13     if ctxs is None: ctxs = Inf.nones
     14     for i in range_of(samples[0]):
---> 15         ctxs = [b.show(ctx=c, **kwargs) for b,c,_ in zip(samples.itemgot(i),ctxs,range(max_n))]
     16     return ctxs
     17 

~/.local/lib/python3.6/site-packages/fastai2/data/core.py in <listcomp>(.0)
     13     if ctxs is None: ctxs = Inf.nones
     14     for i in range_of(samples[0]):
---> 15         ctxs = [b.show(ctx=c, **kwargs) for b,c,_ in zip(samples.itemgot(i),ctxs,range(max_n))]
     16     return ctxs
     17 

AttributeError: 'str' object has no attribute 'show'

Thanks in advance for the help… :slightly_smiling_face:

2

As it says, ‘dls’ seems to be a string.
kindly attach the code for dataloader creation

3

I am sorry for not mentioning the DataLoaders creation in my question. It is created by the following;

dls = tls.dataloaders(bs=64)
dls.show_batch()

and the tls here is the TfmdLists. It is created by the following code;

splits = RandomSplitter(seed=42)(items)
tls = TfmdLists(items, [Resize(224), PetTfm(), FlipItem(p=0.5), ToTensor()], splits=splits)