class_docstr: Constructs a Perceiver feature extractor.
  
  This feature extractor inherits from [`ImageFeatureExtractionMixin`] which contains most of the main methods. Users
  should refer to this superclass for more information regarding those methods.
  
  Args:
      do_center_crop (`bool`, *optional*, defaults to `True`):
          Whether to crop the input at the center. If the input size is smaller than `crop_size` along any edge, the
          image is padded with 0's and then center cropped.
      crop_size (`int`, *optional*, defaults to 256):
          Desired output size when applying center-cropping. Only has an effect if `do_center_crop` is set to `True`.
      do_resize (`bool`, *optional*, defaults to `True`):
          Whether to resize the input to a certain `size`.
      size (`int` or `Tuple(int)`, *optional*, defaults to 224):
          Resize the input to the given size. If a tuple is provided, it should be (width, height). If only an
          integer is provided, then the input will be resized to (size, size). Only has an effect if `do_resize` is
          set to `True`.
      resample (`int`, *optional*, defaults to `PIL.Image.Resampling.BICUBIC`):
          An optional resampling filter. This can be one of `PIL.Image.Resampling.NEAREST`,
          `PIL.Image.Resampling.BOX`, `PIL.Image.Resampling.BILINEAR`, `PIL.Image.Resampling.HAMMING`,
          `PIL.Image.Resampling.BICUBIC` or `PIL.Image.Resampling.LANCZOS`. Only has an effect if `do_resize` is set
          to `True`.
      do_normalize (`bool`, *optional*, defaults to `True`):
          Whether or not to normalize the input with `image_mean` and `image_std`.
      image_mean (`List[int]`, defaults to `[0.485, 0.456, 0.406]`):
          The sequence of means for each channel, to be used when normalizing images.
      image_std (`List[int]`, defaults to `[0.229, 0.224, 0.225]`):
          The sequence of standard deviations for each channel, to be used when normalizing images.
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docstr: Main method to prepare for the model one or several image(s).
  
  <Tip warning={true}>
  
  NumPy arrays and PyTorch tensors are converted to PIL images when resizing, so the most efficient is to pass
  PIL images.
  
  </Tip>
  
  Args:
      images (`PIL.Image.Image`, `np.ndarray`, `torch.Tensor`, `List[PIL.Image.Image]`, `List[np.ndarray]`, `List[torch.Tensor]`):
          The image or batch of images to be prepared. Each image can be a PIL image, NumPy array or PyTorch
          tensor. In case of a NumPy array/PyTorch tensor, each image should be of shape (C, H, W), where C is a
          number of channels, H and W are image height and width.
  
      return_tensors (`str` or [`~utils.TensorType`], *optional*, defaults to `'np'`):
          If set, will return tensors of a particular framework. Acceptable values are:
  
          - `'tf'`: Return TensorFlow `tf.constant` objects.
          - `'pt'`: Return PyTorch `torch.Tensor` objects.
          - `'np'`: Return NumPy `np.ndarray` objects.
          - `'jax'`: Return JAX `jnp.ndarray` objects.
  
  Returns:
      [`BatchFeature`]: A [`BatchFeature`] with the following fields:
  
      - **pixel_values** -- Pixel values to be fed to a model, of shape (batch_size, num_channels, height,
        width).
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code: def __call__(
      self,
      images: ImageInput,
      return_tensors: Optional[Union[str, TensorType]] = None,
      **kwargs,
  ) -> BatchFeature:
      """
      Main method to prepare for the model one or several image(s).
  
      <Tip warning={true}>
  
      NumPy arrays and PyTorch tensors are converted to PIL images when resizing, so the most efficient is to pass
      PIL images.
  
      </Tip>
  
      Args:
          images (`PIL.Image.Image`, `np.ndarray`, `torch.Tensor`, `List[PIL.Image.Image]`, `List[np.ndarray]`, `List[torch.Tensor]`):
              The image or batch of images to be prepared. Each image can be a PIL image, NumPy array or PyTorch
              tensor. In case of a NumPy array/PyTorch tensor, each image should be of shape (C, H, W), where C is a
              number of channels, H and W are image height and width.
  
          return_tensors (`str` or [`~utils.TensorType`], *optional*, defaults to `'np'`):
              If set, will return tensors of a particular framework. Acceptable values are:
  
              - `'tf'`: Return TensorFlow `tf.constant` objects.
              - `'pt'`: Return PyTorch `torch.Tensor` objects.
              - `'np'`: Return NumPy `np.ndarray` objects.
              - `'jax'`: Return JAX `jnp.ndarray` objects.
  
      Returns:
          [`BatchFeature`]: A [`BatchFeature`] with the following fields:
  
          - **pixel_values** -- Pixel values to be fed to a model, of shape (batch_size, num_channels, height,
            width).
      """
      # Input type checking for clearer error
      valid_images = False
  
      # Check that images has a valid type
      if isinstance(
          images, (Image.Image, np.ndarray)
      ) or is_torch_tensor(images):
          valid_images = True
      elif isinstance(images, (list, tuple)):
          if (
              len(images) == 0
              or isinstance(images[0], (Image.Image, np.ndarray))
              or is_torch_tensor(images[0])
          ):
              valid_images = True
  
      if not valid_images:
          raise ValueError(
              "Images must of type `PIL.Image.Image`, `np.ndarray` or `torch.Tensor` (single example),"
              "`List[PIL.Image.Image]`, `List[np.ndarray]` or `List[torch.Tensor]` (batch of examples)."
          )
  
      is_batched = bool(
          isinstance(images, (list, tuple))
          and (
              isinstance(images[0], (Image.Image, np.ndarray))
              or is_torch_tensor(images[0])
          )
      )
  
      if not is_batched:
          images = [images]
  
      # transformations (center cropping + resizing + normalization)
      if self.do_center_crop and self.crop_size is not None:
          images = [self.center_crop(image) for image in images]
      if (
          self.do_resize
          and self.size is not None
          and self.resample is not None
      ):
          images = [
              self.resize(
                  image=image, size=self.size, resample=self.resample
              )
              for image in images
          ]
      if self.do_normalize:
          images = [
              self.normalize(
                  image=image, mean=self.image_mean, std=self.image_std
              )
              for image in images
          ]
  
      # return as BatchFeature
      data = {"pixel_values": images}
      encoded_inputs = BatchFeature(
          data=data, tensor_type=return_tensors
      )
  
      return encoded_inputs
  
file_path: H2O/h2o_flexgen/benchmark/third_party/transformers/src/transformers/models/perceiver/feature_extraction_perceiver.py
imports: from typing import Optional, Union
  import numpy
  from PIL import Image
  from transformers.image_utils import PILImageResampling
  from ...feature_extraction_utils import BatchFeature, FeatureExtractionMixin
  from ...image_utils import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD, ImageFeatureExtractionMixin, ImageInput, is_torch_tensor
  from ...utils import TensorType, logging
label_desc: Use image node_id 3 for calling the PerceiverFeatureExtractor obj's underlying member method code with example usage: obj.__call__(images, return_tensors) and returns: encoded_inputs