I am able to successfully create at Databunch from a list of tensors using the following code:
final_image_list=[fastai.vision.Image(tz) for tz in preds_list]
preds_list is simply a list of tensors extracted from a video using:
t = torch.tensor(np.ascontiguousarray(np.flip(frame, 2)).transpose(2,0,1)).float()/255
when i attempt to load this into a learner, i receive the error “‘Image’ object has no attribute ‘read’”. If i convert the data to a tensor or nd.array, i get the same error. Reviewing source seems to indicate that this is because it is looking specifically for a physical file in disk and cannot actually work from tensors in RAM. Is that correct?
Is there a workaround short of going over to pytorch?
The actual error is below:
Thanks for any input
AttributeError Traceback (most recent call last)
~/anaconda3/envs/devml/lib/python3.7/site-packages/PIL/Image.py in open(fp, mode)
2655 try:
-> 2656 fp.seek(0)
2657 except (AttributeError, io.UnsupportedOperation):
AttributeError: ‘Image’ object has no attribute ‘seek’
During handling of the above exception, another exception occurred:
AttributeError Traceback (most recent call last)
in
----> 1 learn = load_learner(“models”, file=‘final-stage-328-fp32.pkl’, test=final_image_list)
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/basic_train.py in load_learner(path, file, test, **db_kwargs)
611 model = state.pop(‘model’)
612 src = LabelLists.load_state(path, state.pop(‘data’))
–> 613 if test is not None: src.add_test(test)
614 data = src.databunch(**db_kwargs)
615 cb_state = state.pop(‘cb_state’)
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/data_block.py in add_test(self, items, label, tfms, tfm_y)
560 elif isinstance(items, ItemList): items = self.valid.x.new(items.items, inner_df=items.inner_df).process()
561 else: items = self.valid.x.new(items).process()
–> 562 self.test = self.valid.new(items, labels, tfms=tfms, tfm_y=tfm_y)
563 return self
564
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/data_block.py in new(self, x, y, tfms, tfm_y, **kwargs)
627 tfms,tfm_y = ifnone(tfms, self.tfms),ifnone(tfm_y, self.tfm_y)
628 if isinstance(x, ItemList):
–> 629 return self.class(x, y, tfms=tfms, tfm_y=tfm_y, **self.tfmargs)
630 else:
631 return self.new(self.x.new(x, **kwargs), self.y.new(y, **kwargs), tfms=tfms, tfm_y=tfm_y).process()
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/data_block.py in init(self, x, y, tfms, tfm_y, **kwargs)
599 self.y.x = x
600 self.item=None
–> 601 self.transform(tfms, **kwargs)
602
603 def len(self)->int: return len(self.x) if self.item is None else 1
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/data_block.py in transform(self, tfms, tfm_y, **kwargs)
719 def transform(self, tfms:TfmList, tfm_y:bool=None, **kwargs):
720 “Set the tfms and tfm_y value to be applied to the inputs and targets.”
–> 721 _check_kwargs(self.x, tfms, **kwargs)
722 if tfm_y is None: tfm_y = self.tfm_y
723 tfms_y = None if tfms is None else list(filter(lambda t: getattr(t, ‘use_on_y’, True), listify(tfms)))
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/data_block.py in _check_kwargs(ds, tfms, **kwargs)
588 if (tfms is None or len(tfms) == 0) and len(kwargs) == 0: return
589 if len(ds.items) >= 1:
–> 590 x = ds[0]
591 try: x.apply_tfms(tfms, **kwargs)
592 except Exception as e:
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/data_block.py in getitem(self, idxs)
116 “returns a single item based if idxs is an integer or a new ItemList object if idxs is a range.”
117 idxs = try_int(idxs)
–> 118 if isinstance(idxs, Integral): return self.get(idxs)
119 else: return self.new(self.items[idxs], inner_df=index_row(self.inner_df, idxs))
120
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/vision/data.py in get(self, i)
269 def get(self, i):
270 fn = super().get(i)
–> 271 res = self.open(fn)
272 self.sizes[i] = res.size
273 return res
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/vision/data.py in open(self, fn)
265 def open(self, fn):
266 “Open image in fn, subclass and overwrite for custom behavior.”
–> 267 return open_image(fn, convert_mode=self.convert_mode, after_open=self.after_open)
268
269 def get(self, i):
~/anaconda3/envs/devml/lib/python3.7/site-packages/fastai/vision/image.py in open_image(fn, div, convert_mode, cls, after_open)
391 with warnings.catch_warnings():
392 warnings.simplefilter(“ignore”, UserWarning) # EXIF warning from TiffPlugin
–> 393 x = PIL.Image.open(fn).convert(convert_mode)
394 if after_open: x = after_open(x)
395 x = pil2tensor(x,np.float32)
~/anaconda3/envs/devml/lib/python3.7/site-packages/PIL/Image.py in open(fp, mode)
2656 fp.seek(0)
2657 except (AttributeError, io.UnsupportedOperation):
-> 2658 fp = io.BytesIO(fp.read())
2659 exclusive_fp = True
2660
AttributeError: ‘Image’ object has no attribute ‘read’