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KOSMOS-2

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KOSMOS-2

Overview

The KOSMOS-2 model was proposed in Kosmos-2: Grounding Multimodal Large Language Models to the World by Zhiliang Peng, Wenhui Wang, Li Dong, Yaru Hao, Shaohan Huang, Shuming Ma, Furu Wei.

KOSMOS-2 is a Transformer-based causal language model and is trained using the next-word prediction task on a web-scale dataset of grounded image-text pairs GRIT. The spatial coordinates of the bounding boxes in the dataset are converted to a sequence of location tokens, which are appended to their respective entity text spans (for example, a snowman followed by <patch_index_0044><patch_index_0863>). The data format is similar to “hyperlinks” that connect the object regions in an image to their text span in the corresponding caption.

The abstract from the paper is the following:

We introduce Kosmos-2, a Multimodal Large Language Model (MLLM), enabling new capabilities of perceiving object descriptions (e.g., bounding boxes) and grounding text to the visual world. Specifically, we represent refer expressions as links in Markdown, i.e., “[text span](bounding boxes)”, where object descriptions are sequences of location tokens. Together with multimodal corpora, we construct large-scale data of grounded image-text pairs (called GrIT) to train the model. In addition to the existing capabilities of MLLMs (e.g., perceiving general modalities, following instructions, and performing in-context learning), Kosmos-2 integrates the grounding capability into downstream applications. We evaluate Kosmos-2 on a wide range of tasks, including (i) multimodal grounding, such as referring expression comprehension, and phrase grounding, (ii) multimodal referring, such as referring expression generation, (iii) perception-language tasks, and (iv) language understanding and generation. This work lays out the foundation for the development of Embodiment AI and sheds light on the big convergence of language, multimodal perception, action, and world modeling, which is a key step toward artificial general intelligence. Code and pretrained models are available at https://aka.ms/kosmos-2.

Overview of tasks that KOSMOS-2 can handle. Taken from the original paper.

Example

>>> from PIL import Image
>>> import requests
>>> from transformers import AutoProcessor, Kosmos2ForConditionalGeneration

>>> model = Kosmos2ForConditionalGeneration.from_pretrained("microsoft/kosmos-2-patch14-224")
>>> processor = AutoProcessor.from_pretrained("microsoft/kosmos-2-patch14-224")

>>> url = "https://huggingface.co/microsoft/kosmos-2-patch14-224/resolve/main/snowman.jpg"
>>> image = Image.open(requests.get(url, stream=True).raw)

>>> prompt = "<grounding> An image of"

>>> inputs = processor(text=prompt, images=image, return_tensors="pt")

>>> generated_ids = model.generate(
...     pixel_values=inputs["pixel_values"],
...     input_ids=inputs["input_ids"],
...     attention_mask=inputs["attention_mask"],
...     image_embeds=None,
...     image_embeds_position_mask=inputs["image_embeds_position_mask"],
...     use_cache=True,
...     max_new_tokens=64,
... )
>>> generated_text = processor.batch_decode(generated_ids, skip_special_tokens=True)[0]
>>> processed_text = processor.post_process_generation(generated_text, cleanup_and_extract=False)
>>> processed_text
'<grounding> An image of<phrase> a snowman</phrase><object><patch_index_0044><patch_index_0863></object> warming himself by<phrase> a fire</phrase><object><patch_index_0005><patch_index_0911></object>.'

>>> caption, entities = processor.post_process_generation(generated_text)
>>> caption
'An image of a snowman warming himself by a fire.'

>>> entities
[('a snowman', (12, 21), [(0.390625, 0.046875, 0.984375, 0.828125)]), ('a fire', (41, 47), [(0.171875, 0.015625, 0.484375, 0.890625)])]

This model was contributed by Yih-Dar SHIEH. The original code can be found here.

Kosmos2Config

class transformers.Kosmos2Config

< source >

( text_config = None vision_config = None latent_query_num = 64 **kwargs )

Parameters

text_config (dict, optional) — Dictionary of configuration options used to initialize Kosmos2TextConfig.
vision_config (dict, optional) — Dictionary of configuration options used to initialize Kosmos2VisionConfig.
latent_query_num (int, optional, defaults to 64) — The number of latent query tokens that represent the image features used in the text decoder component.
kwargs (optional) — Dictionary of keyword arguments.

This is the configuration class to store the configuration of a Kosmos2Model. It is used to instantiate a KOSMOS-2 model according to the specified arguments, defining the model architecture. Instantiating a configuration with the defaults will yield a similar configuration to that of the KOSMOS-2 microsoft/kosmos-2-patch14-224 architecture.

Example:

>>> from transformers import Kosmos2Config, Kosmos2Model

>>> # Initializing a Kosmos-2 kosmos-2-patch14-224 style configuration
>>> configuration = Kosmos2Config()

>>> # Initializing a model (with random weights) from the kosmos-2-patch14-224 style configuration
>>> model = Kosmos2Model(configuration)

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

Kosmos2ImageProcessor

Kosmos2Processor

class transformers.Kosmos2Processor

< source >

( image_processor tokenizer num_patch_index_tokens = 1024 *kwargs )

Parameters

image_processor (CLIPImageProcessor) — An instance of CLIPImageProcessor. The image processor is a required input.
tokenizer (XLMRobertaTokenizerFast) — An instance of [‘XLMRobertaTokenizerFast`]. The tokenizer is a required input.
num_patch_index_tokens (int, optional, defaults to 1024) — The number of tokens that represent patch indices.

Constructs an KOSMOS-2 processor which wraps a KOSMOS-2 image processor and a KOSMOS-2 tokenizer into a single processor.

Kosmos2Processor offers all the functionalities of CLIPImageProcessor and some functionalities of XLMRobertaTokenizerFast. See the docstring of call() and decode() for more information.

call

< source >

( images: typing.Union[ForwardRef('PIL.Image.Image'), numpy.ndarray, ForwardRef('torch.Tensor'), typing.List[ForwardRef('PIL.Image.Image')], typing.List[numpy.ndarray], typing.List[ForwardRef('torch.Tensor')]] = None text: typing.Union[str, typing.List[str]] = None audio = None videos = None **kwargs: typing_extensions.Unpack[transformers.models.kosmos2.processing_kosmos2.Kosmos2ProcessorKwargs] )

Parameters

bboxes (Union[List[Tuple[int]], List[Tuple[float]], List[List[Tuple[int]]], List[List[Tuple[float]]]], optional) — The bounding bboxes associated to texts.
num_image_tokens (int, optional defaults to 64) — The number of (consecutive) places that are used to mark the placeholders to store image information. This should be the same as latent_query_num in the instance of Kosmos2Config you are using.
first_image_token_id (int, optional) — The token id that will be used for the first place of the subsequence that is reserved to store image information. If unset, will default to self.tokenizer.unk_token_id + 1.
add_eos_token (bool, defaults to False) — Whether or not to include EOS token id in the encoding when add_special_tokens=True.

This method uses CLIPImageProcessor.call() method to prepare image(s) for the model, and XLMRobertaTokenizerFast.call() to prepare text for the model.

Please refer to the docstring of the above two methods for more information.

The rest of this documentation shows the arguments specific to Kosmos2Processor.

Kosmos2Model

class transformers.Kosmos2Model

< source >

( config: Kosmos2Config )

Parameters

config (Kosmos2Config) — Model configuration class with all the parameters of the model. Initializing with a config file does not load the weights associated with the model, only the configuration. Check out the from_pretrained() method to load the model weights.

KOSMOS-2 Model for generating text and image features. The model consists of a vision encoder and a language model.

This model inherits from PreTrainedModel. Check the superclass documentation for the generic methods the library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads etc.)

This model is also a PyTorch torch.nn.Module subclass. Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage and behavior.

forward

< source >

( pixel_values: typing.Optional[torch.Tensor] = None input_ids: typing.Optional[torch.Tensor] = None image_embeds_position_mask: typing.Optional[torch.Tensor] = None attention_mask: typing.Optional[torch.Tensor] = None head_mask: typing.Optional[torch.Tensor] = None past_key_values: typing.Optional[typing.List[torch.FloatTensor]] = None image_embeds: typing.Optional[torch.Tensor] = None inputs_embeds: typing.Optional[torch.Tensor] = None position_ids: typing.Optional[torch.Tensor] = None use_cache: typing.Optional[bool] = None output_attentions: typing.Optional[bool] = None output_hidden_states: typing.Optional[bool] = None interpolate_pos_encoding: bool = False return_dict: typing.Optional[bool] = None ) → transformers.models.kosmos2.modeling_kosmos2.Kosmos2ModelOutput or tuple(torch.FloatTensor)

Parameters

pixel_values (torch.FloatTensor of shape (batch_size, num_channels, height, width)) — Pixel values. Pixel values can be obtained using AutoImageProcessor. See CLIPImageProcessor.call() for details.
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) — Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide it.

Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and PreTrainedTokenizer.call() for details.

What are input IDs?
image_embeds_position_mask (torch.Tensor of shape (batch_size, sequence_length), optional) — Mask to indicate the location in a sequence to insert the image features . Mask values selected in [0, 1]:
- 1 for places where to put the image features,
- 0 for places that are not for image features (i.e. for text tokens).
attention_mask (torch.Tensor of shape (batch_size, sequence_length), optional) — Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
- 1 for tokens that are not masked,
- 0 for tokens that are masked.
What are attention masks?
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) — Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
- 1 indicates the head is not masked,
- 0 indicates the head is masked.
past_key_values (tuple(tuple(torch.FloatTensor)) of length config.n_layers with each tuple having 4 tensors of shape (batch_size, num_heads, sequence_length - 1, embed_size_per_head)) — Contains precomputed key and value hidden states of the attention blocks. Can be used to speed up decoding.

If past_key_values are used, the user can optionally input only the last decoder_input_ids (those that don’t have their past key value states given to this model) of shape (batch_size, 1) instead of all decoder_input_ids of shape (batch_size, sequence_length).
image_embeds — (torch.FloatTensor of shape (batch_size, latent_query_num, hidden_size), optional): Sequence of hidden-states at the output of Kosmos2ImageToTextProjection.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) — Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This is useful if you want more control over how to convert input_ids indices into associated vectors than the model’s internal embedding lookup matrix.
position_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) — Indices of positions of each input sequence tokens in the position embeddings. Selected in the range [0, config.max_position_embeddings - 1].

What are position IDs?
use_cache (bool, optional) — If set to True, past_key_values key value states are returned and can be used to speed up decoding (see past_key_values).
output_attentions (bool, optional) — Whether or not to return the attentions tensors of all attention layers. See attentions under returned tensors for more detail.
output_hidden_states (bool, optional) — Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for more detail.
interpolate_pos_encoding (bool, optional, defaults False) — Whether to interpolate the pre-trained position encodings.
return_dict (bool, optional) — Whether or not to return a ModelOutput instead of a plain tuple.

Returns

transformers.models.kosmos2.modeling_kosmos2.Kosmos2ModelOutput or tuple(torch.FloatTensor)

A transformers.models.kosmos2.modeling_kosmos2.Kosmos2ModelOutput 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 (<class 'transformers.models.kosmos2.configuration_kosmos2.Kosmos2Config'>) and inputs.

last_hidden_state (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size)) — Sequence of hidden-states at the output of the last layer of the model.
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 layer) of shape (batch_size, sequence_length, hidden_size).

Hidden-states of the model at the output of each layer plus the optional initial embedding outputs.
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, sequence_length, sequence_length).

Attentions weights after the attention softmax, used to compute the weighted average in the self-attention heads.
image_embeds (torch.FloatTensor of shape (batch_size, latent_query_num, hidden_size), optional) — Sequence of hidden-states at the output of Kosmos2ImageToTextProjection.
projection_attentions (tuple(torch.FloatTensor), optional) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).

Attentions weights given by Kosmos2ImageToTextProjection, after the attention softmax, used to compute the weighted average in the self-attention heads.
vision_model_output(BaseModelOutputWithPooling, optional) — The output of the Kosmos2VisionModel.
past_key_values (tuple(tuple(torch.FloatTensor)), optional, returned when use_cache=True is passed or when config.use_cache=True) — Tuple of tuple(torch.FloatTensor) of length config.n_layers, with each tuple having 2 tensors of shape (batch_size, num_heads, sequence_length, embed_size_per_head)) and optionally if config.is_encoder_decoder=True 2 additional tensors of shape (batch_size, num_heads, encoder_sequence_length, embed_size_per_head).

Contains pre-computed hidden-states (key and values in the self-attention blocks and optionally if config.is_encoder_decoder=True in the cross-attention blocks) that can be used (see past_key_values input) to speed up sequential decoding.

The Kosmos2Model 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:

>>> from PIL import Image
>>> import requests
>>> from transformers import AutoProcessor, Kosmos2Model

>>> model = Kosmos2Model.from_pretrained("microsoft/kosmos-2-patch14-224")
>>> processor = AutoProcessor.from_pretrained("microsoft/kosmos-2-patch14-224")

>>> url = "https://huggingface.co/microsoft/kosmos-2-patch14-224/resolve/main/snowman.jpg"
>>> image = Image.open(requests.get(url, stream=True).raw)

>>> text = (
...     "<grounding> An image of<phrase> a snowman</phrase><object><patch_index_0044><patch_index_0863>"
...     "</object> warming himself by<phrase> a fire</phrase><object><patch_index_0005><patch_index_0911>"
...     "</object>"
... )

>>> inputs = processor(text=text, images=image, return_tensors="pt", add_eos_token=True)

>>> last_hidden_state = model(
...     pixel_values=inputs["pixel_values"],
...     input_ids=inputs["input_ids"],
...     attention_mask=inputs["attention_mask"],
...     image_embeds_position_mask=inputs["image_embeds_position_mask"],
... ).last_hidden_state
>>> list(last_hidden_state.shape)
[1, 91, 2048]

Kosmos2ForConditionalGeneration

class transformers.Kosmos2ForConditionalGeneration

< source >

( config: Kosmos2Config )

Parameters

config (Kosmos2Config) — Model configuration class with all the parameters of the model. Initializing with a config file does not load the weights associated with the model, only the configuration. Check out the from_pretrained() method to load the model weights.

KOSMOS-2 Model for generating text and bounding boxes given an image. The model consists of a vision encoder and a language model.

This model is also a PyTorch torch.nn.Module subclass. Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage and behavior.

forward

< source >

( pixel_values: typing.Optional[torch.Tensor] = None input_ids: typing.Optional[torch.Tensor] = None image_embeds_position_mask: typing.Optional[torch.Tensor] = None attention_mask: typing.Optional[torch.Tensor] = None head_mask: typing.Optional[torch.Tensor] = None past_key_values: typing.Optional[typing.List[torch.FloatTensor]] = None image_embeds: typing.Optional[torch.Tensor] = None inputs_embeds: typing.Optional[torch.Tensor] = None position_ids: typing.Optional[torch.Tensor] = None labels: typing.Optional[torch.LongTensor] = None use_cache: typing.Optional[bool] = None output_attentions: typing.Optional[bool] = None output_hidden_states: typing.Optional[bool] = None return_dict: typing.Optional[bool] = None ) → transformers.models.kosmos2.modeling_kosmos2.Kosmos2ForConditionalGenerationModelOutput or tuple(torch.FloatTensor)

Parameters

pixel_values (torch.FloatTensor of shape (batch_size, num_channels, height, width)) — Pixel values. Pixel values can be obtained using AutoImageProcessor. See CLIPImageProcessor.call() for details.
input_ids (torch.LongTensor of shape (batch_size, sequence_length)) — Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide it.

Indices can be obtained using AutoTokenizer. See PreTrainedTokenizer.encode() and PreTrainedTokenizer.call() for details.

What are input IDs?
image_embeds_position_mask (torch.Tensor of shape (batch_size, sequence_length), optional) — Mask to indicate the location in a sequence to insert the image features . Mask values selected in [0, 1]:
- 1 for places where to put the image features,
- 0 for places that are not for image features (i.e. for text tokens).
attention_mask (torch.Tensor of shape (batch_size, sequence_length), optional) — Mask to avoid performing attention on padding token indices. Mask values selected in [0, 1]:
- 1 for tokens that are not masked,
- 0 for tokens that are masked.
What are attention masks?
head_mask (torch.FloatTensor of shape (num_heads,) or (num_layers, num_heads), optional) — Mask to nullify selected heads of the self-attention modules. Mask values selected in [0, 1]:
- 1 indicates the head is not masked,
- 0 indicates the head is masked.
past_key_values (tuple(tuple(torch.FloatTensor)) of length config.n_layers with each tuple having 4 tensors of shape (batch_size, num_heads, sequence_length - 1, embed_size_per_head)) — Contains precomputed key and value hidden states of the attention blocks. Can be used to speed up decoding.

If past_key_values are used, the user can optionally input only the last decoder_input_ids (those that don’t have their past key value states given to this model) of shape (batch_size, 1) instead of all decoder_input_ids of shape (batch_size, sequence_length).
image_embeds — (torch.FloatTensor of shape (batch_size, latent_query_num, hidden_size), optional): Sequence of hidden-states at the output of Kosmos2ImageToTextProjection.
inputs_embeds (torch.FloatTensor of shape (batch_size, sequence_length, hidden_size), optional) — Optionally, instead of passing input_ids you can choose to directly pass an embedded representation. This is useful if you want more control over how to convert input_ids indices into associated vectors than the model’s internal embedding lookup matrix.
position_ids (torch.LongTensor of shape (batch_size, sequence_length), optional) — Indices of positions of each input sequence tokens in the position embeddings. Selected in the range [0, config.max_position_embeddings - 1].

What are position IDs?
use_cache (bool, optional) — If set to True, past_key_values key value states are returned and can be used to speed up decoding (see past_key_values).
output_attentions (bool, optional) — Whether or not to return the attentions tensors of all attention layers. See attentions under returned tensors for more detail.
output_hidden_states (bool, optional) — Whether or not to return the hidden states of all layers. See hidden_states under returned tensors for more detail.
interpolate_pos_encoding (bool, optional, defaults False) — Whether to interpolate the pre-trained position encodings.
return_dict (bool, optional) — Whether or not to return a ModelOutput instead of a plain tuple.
labels (torch.LongTensor of shape (batch_size, sequence_length), optional) — Labels for computing the left-to-right language modeling loss (next word prediction). Indices should be in [-100, 0, ..., config.vocab_size] (see input_ids docstring) Tokens with indices set to -100 are ignored (masked), the loss is only computed for the tokens with labels in [0, ..., config.vocab_size]

Returns

transformers.models.kosmos2.modeling_kosmos2.Kosmos2ForConditionalGenerationModelOutput or tuple(torch.FloatTensor)

A transformers.models.kosmos2.modeling_kosmos2.Kosmos2ForConditionalGenerationModelOutput 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 (<class 'transformers.models.kosmos2.configuration_kosmos2.Kosmos2Config'>) and inputs.

loss (torch.FloatTensor of shape (1,), optional, returned when labels is provided) — Language modeling loss (for next-token prediction).
logits (torch.FloatTensor of shape (batch_size, sequence_length, config.vocab_size)) — Prediction scores of the language modeling head (scores for each vocabulary token 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 layer) of shape (batch_size, sequence_length, hidden_size).

Hidden-states of the model at the output of each layer plus the optional initial embedding outputs.
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, sequence_length, sequence_length).

Attentions weights after the attention softmax, used to compute the weighted average in the self-attention heads.
image_embeds (torch.FloatTensor of shape (batch_size, latent_query_num, hidden_size), optional) — Sequence of hidden-states at the output of Kosmos2ImageToTextProjection.
projection_attentions (tuple(torch.FloatTensor), optional) — Tuple of torch.FloatTensor (one for each layer) of shape (batch_size, num_heads, sequence_length, sequence_length).

Attentions weights given by Kosmos2ImageToTextProjection, after the attention softmax, used to compute the weighted average in the self-attention heads.
vision_model_output(BaseModelOutputWithPooling, optional) — The output of the Kosmos2VisionModel.
past_key_values (tuple(tuple(torch.FloatTensor)), optional, returned when use_cache=True is passed or when config.use_cache=True) — Tuple of tuple(torch.FloatTensor) of length config.n_layers, with each tuple having 2 tensors of shape (batch_size, num_heads, sequence_length, embed_size_per_head)) and optionally if config.is_encoder_decoder=True 2 additional tensors of shape (batch_size, num_heads, encoder_sequence_length, embed_size_per_head).

Contains pre-computed hidden-states (key and values in the self-attention blocks and optionally if config.is_encoder_decoder=True in the cross-attention blocks) that can be used (see past_key_values input) to speed up sequential decoding.

The Kosmos2ForConditionalGeneration forward method, overrides the __call__ special method.

Examples:

>>> from PIL import Image
>>> import requests
>>> from transformers import AutoProcessor, Kosmos2ForConditionalGeneration

>>> model = Kosmos2ForConditionalGeneration.from_pretrained("microsoft/kosmos-2-patch14-224")
>>> processor = AutoProcessor.from_pretrained("microsoft/kosmos-2-patch14-224")

>>> url = "https://huggingface.co/microsoft/kosmos-2-patch14-224/resolve/main/snowman.jpg"
>>> image = Image.open(requests.get(url, stream=True).raw)

>>> prompt = "<grounding> An image of"

>>> inputs = processor(text=prompt, images=image, return_tensors="pt")

>>> generated_ids = model.generate(
...     pixel_values=inputs["pixel_values"],
...     input_ids=inputs["input_ids"],
...     attention_mask=inputs["attention_mask"],
...     image_embeds=None,
...     image_embeds_position_mask=inputs["image_embeds_position_mask"],
...     use_cache=True,
...     max_new_tokens=64,
... )
>>> generated_text = processor.batch_decode(generated_ids, skip_special_tokens=True)[0]
>>> processed_text = processor.post_process_generation(generated_text, cleanup_and_extract=False)
>>> processed_text
'<grounding> An image of<phrase> a snowman</phrase><object><patch_index_0044><patch_index_0863></object> warming himself by<phrase> a fire</phrase><object><patch_index_0005><patch_index_0911></object>.'

>>> caption, entities = processor.post_process_generation(generated_text)
>>> caption
'An image of a snowman warming himself by a fire.'

>>> entities
[('a snowman', (12, 21), [(0.390625, 0.046875, 0.984375, 0.828125)]), ('a fire', (41, 47), [(0.171875, 0.015625, 0.484375, 0.890625)])]

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