#
TimmWrapper

##
Overview

Helper class to enable loading timm models to be used with the transformers library and its autoclasses.

    >>> import torch
    >>> from PIL import Image
    >>> from urllib.request import urlopen
    >>> from transformers import AutoModelForImageClassification, AutoImageProcessor

    >>> # Load image
    >>> image = Image.open(urlopen(
    ...     'https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/beignets-task-guide.png'
    ... ))

    >>> # Load model and image processor
    >>> checkpoint = "timm/resnet50.a1_in1k"
    >>> image_processor = AutoImageProcessor.from_pretrained(checkpoint)
    >>> model = AutoModelForImageClassification.from_pretrained(checkpoint).eval()

    >>> # Preprocess image
    >>> inputs = image_processor(image)

    >>> # Forward pass
    >>> with torch.no_grad():
    ...     logits = model(**inputs).logits

    >>> # Get top 5 predictions
    >>> top5_probabilities, top5_class_indices = torch.topk(logits.softmax(dim=1) * 100, k=5)

##
Resources:

A list of official Hugging Face and community (indicated by 🌎) resources to help you get started with TimmWrapper.

Image Classification

- Collection of Example Notebook 🌎

For a more detailed overview please read the official blog post on the timm integration.

##
TimmWrapperConfig

###
class transformers.TimmWrapperConfig

< source >

( initializer_range: float = 0.02 do_pooling: bool = True **kwargs )

Parameters

- initializer_range (`float`, optional, defaults to 0.02) — The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
- do_pooling (`bool`, optional, defaults to `True`) — Whether to do pooling for the last_hidden_state in `TimmWrapperModel` or not.

This is the configuration class to store the configuration for a timm backbone `TimmWrapper`.

It is used to instantiate a timm model according to the specified arguments, defining the model.

Configuration objects inherit from PretrainedConfig and can be used to control the model outputs. Read the documentation from PretrainedConfig for more information.

Config loads imagenet label descriptions and stores them in `id2label` attribute, `label2id` attribute for default imagenet models is set to `None` due to occlusions in the label descriptions.

Example:

    >>> from transformers import TimmWrapperModel

    >>> # Initializing a timm model
    >>> model = TimmWrapperModel.from_pretrained("timm/resnet18.a1_in1k")

    >>> # Accessing the model configuration
    >>> configuration = model.config

##
TimmWrapperImageProcessor

###
class transformers.TimmWrapperImageProcessor

< source >

( pretrained_cfg: typing.Dict[str, typing.Any] architecture: typing.Optional[str] = None **kwargs )

Parameters

- pretrained_cfg (`Dict[str, Any]`) — The configuration of the pretrained model used to resolve evaluation and training transforms.
- architecture (`Optional[str]`, optional) — Name of the architecture of the model.

Wrapper class for timm models to be used within transformers.

####
preprocess

< source >

( images: typing.Union[ForwardRef('PIL.Image.Image'), numpy.ndarray, ForwardRef('torch.Tensor'), list['PIL.Image.Image'], list[numpy.ndarray], list['torch.Tensor']] return_tensors: typing.Union[str, transformers.utils.generic.TensorType, NoneType] = 'pt' )

Parameters

- images (`ImageInput`) — Image to preprocess. Expects a single or batch of images
- return_tensors (`str` or `TensorType`, optional) — The type of tensors to return.

Preprocess an image or batch of images.

##
TimmWrapperModel

###
class transformers.TimmWrapperModel

< source >

( config: TimmWrapperConfig )

Wrapper class for timm models to be used in transformers.

####
forward

< source >

( pixel_values: FloatTensor output_attentions: typing.Optional[bool] = None output_hidden_states: typing.Union[bool, typing.List[int], NoneType] = None return_dict: typing.Optional[bool] = None do_pooling: typing.Optional[bool] = None **kwargs ) →
`transformers.models.timm_wrapper.modeling_timm_wrapper.TimmWrapperModelOutput` or `tuple(torch.FloatTensor)`

Parameters

- pixel_values (`torch.FloatTensor` of shape `(batch_size, num_channels, image_size, image_size)`) — The tensors corresponding to the input images. Pixel values can be obtained using `{image_processor_class}`. See `{image_processor_class}.__call__` for details (`{processor_class}` uses `{image_processor_class}` for processing images).
- output_attentions (`bool`, optional) — Whether or not to return the attentions tensors of all attention layers. Not compatible with timm wrapped models.
- output_hidden_states (`Union[bool, List[int], NoneType]`, optional) — Whether or not to return the hidden states of all layers. Not compatible with timm wrapped models.
- return_dict (`bool`, optional) — Whether or not to return a ModelOutput instead of a plain tuple.
- do_pooling (`bool`, optional) — Whether to do pooling for the last_hidden_state in `TimmWrapperModel` or not. If `None` is passed, the `do_pooling` value from the config is used.

Returns

`transformers.models.timm_wrapper.modeling_timm_wrapper.TimmWrapperModelOutput` or `tuple(torch.FloatTensor)`

A `transformers.models.timm_wrapper.modeling_timm_wrapper.TimmWrapperModelOutput` or a tuple of `torch.FloatTensor` (if `return_dict=False` is passed or when `config.return_dict=False`) comprising various elements depending on the configuration (TimmWrapperConfig) and inputs.

- last_hidden_state (`torch.FloatTensor`) — The last hidden state of the model, output before applying the classification head.
- pooler_output (`torch.FloatTensor`, optional) — The pooled output derived from the last hidden state, if applicable.
- hidden_states (`tuple(torch.FloatTensor)`, optional) — A tuple containing the intermediate hidden states of the model at the output of each layer or specified layers. Returned if `output_hidden_states=True` is set or if `config.output_hidden_states=True`.
- attentions (`tuple(torch.FloatTensor)`, optional) — A tuple containing the intermediate attention weights of the model at the output of each layer. Returned if `output_attentions=True` is set or if `config.output_attentions=True`. Note: Currently, Timm models do not support attentions output.

The TimmWrapperModel forward method, overrides the `__call__` special method.

Although the recipe for forward pass needs to be defined within this function, one should call the `Module` instance afterwards instead of this since the former takes care of running the pre and post processing steps while the latter silently ignores them.

Examples:

    >>> import torch
    >>> from PIL import Image
    >>> from urllib.request import urlopen
    >>> from transformers import AutoModel, AutoImageProcessor

    >>> # Load image
    >>> image = Image.open(urlopen(
    ...     'https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/beignets-task-guide.png'
    ... ))

    >>> # Load model and image processor
    >>> checkpoint = "timm/resnet50.a1_in1k"
    >>> image_processor = AutoImageProcessor.from_pretrained(checkpoint)
    >>> model = AutoModel.from_pretrained(checkpoint).eval()

    >>> # Preprocess image
    >>> inputs = image_processor(image)

    >>> # Forward pass
    >>> with torch.no_grad():
    ...     outputs = model(**inputs)

    >>> # Get pooled output
    >>> pooled_output = outputs.pooler_output

    >>> # Get last hidden state
    >>> last_hidden_state = outputs.last_hidden_state

##
TimmWrapperForImageClassification

###
class transformers.TimmWrapperForImageClassification

< source >

( config: TimmWrapperConfig )

Wrapper class for timm models to be used in transformers for image classification.

####
forward

< source >

( pixel_values: FloatTensor labels: typing.Optional[torch.LongTensor] = None output_attentions: typing.Optional[bool] = None output_hidden_states: typing.Union[bool, typing.List[int], NoneType] = None return_dict: typing.Optional[bool] = None **kwargs ) →
transformers.modeling_outputs.ImageClassifierOutput or `tuple(torch.FloatTensor)`

Parameters

- pixel_values (`torch.FloatTensor` of shape `(batch_size, num_channels, image_size, image_size)`) — The tensors corresponding to the input images. Pixel values can be obtained using `{image_processor_class}`. See `{image_processor_class}.__call__` for details (`{processor_class}` uses `{image_processor_class}` for processing images).
- labels (`torch.LongTensor` of shape `(batch_size,)`, optional) — Labels for computing the image classification/regression loss. Indices should be in `[0, ..., config.num_labels - 1]`. If `config.num_labels == 1` a regression loss is computed (Mean-Square loss), If `config.num_labels > 1` a classification loss is computed (Cross-Entropy).
- output_attentions (`bool`, optional) — Whether or not to return the attentions tensors of all attention layers. Not compatible with timm wrapped models.
- output_hidden_states (`Union[bool, List[int], NoneType]`, optional) — Whether or not to return the hidden states of all layers. Not compatible with timm wrapped models.
- return_dict (`bool`, optional) — Whether or not to return a ModelOutput instead of a plain tuple. **kwargs: Additional keyword arguments passed along to the `timm` model forward.

Returns

transformers.modeling_outputs.ImageClassifierOutput or `tuple(torch.FloatTensor)`

A transformers.modeling_outputs.ImageClassifierOutput or a tuple of `torch.FloatTensor` (if `return_dict=False` is passed or when `config.return_dict=False`) comprising various elements depending on the configuration (TimmWrapperConfig) and inputs.

- loss (`torch.FloatTensor` of shape `(1,)`, optional, returned when `labels` is provided) — Classification (or regression if config.num_labels==1) loss.

- logits (`torch.FloatTensor` of shape `(batch_size, config.num_labels)`) — Classification (or regression if config.num_labels==1) scores (before SoftMax).

- hidden_states (`tuple(torch.FloatTensor)`, optional, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`) — Tuple of `torch.FloatTensor` (one for the output of the embeddings, if the model has an embedding layer, + one for the output of each stage) of shape `(batch_size, sequence_length, hidden_size)`. Hidden-states (also called feature maps) of the model at the output of each stage.

- attentions (`tuple(torch.FloatTensor)`, optional, returned when `output_attentions=True` is passed or when `config.output_attentions=True`) — Tuple of `torch.FloatTensor` (one for each layer) of shape `(batch_size, num_heads, patch_size, sequence_length)`.

  Attentions weights after the attention softmax, used to compute the weighted average in the self-attention heads.

The TimmWrapperForImageClassification forward method, overrides the `__call__` special method.

Although the recipe for forward pass needs to be defined within this function, one should call the `Module` instance afterwards instead of this since the former takes care of running the pre and post processing steps while the latter silently ignores them.

Examples:

    >>> import torch
    >>> from PIL import Image
    >>> from urllib.request import urlopen
    >>> from transformers import AutoModelForImageClassification, AutoImageProcessor

    >>> # Load image
    >>> image = Image.open(urlopen(
    ...     'https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/beignets-task-guide.png'
    ... ))

    >>> # Load model and image processor
    >>> checkpoint = "timm/resnet50.a1_in1k"
    >>> image_processor = AutoImageProcessor.from_pretrained(checkpoint)
    >>> model = AutoModelForImageClassification.from_pretrained(checkpoint).eval()

    >>> # Preprocess image
    >>> inputs = image_processor(image)

    >>> # Forward pass
    >>> with torch.no_grad():
    ...     logits = model(**inputs).logits

    >>> # Get top 5 predictions
    >>> top5_probabilities, top5_class_indices = torch.topk(logits.softmax(dim=1) * 100, k=5)

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