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# coding=utf-8 | |
# Copyright 2021 Microsoft Research and the HuggingFace Inc. team. | |
# | |
# Licensed under the Apache License, Version 2.0 (the "License"); | |
# you may not use this file except in compliance with the License. | |
# You may obtain a copy of the License at | |
# | |
# http://www.apache.org/licenses/LICENSE-2.0 | |
# | |
# Unless required by applicable law or agreed to in writing, software | |
# distributed under the License is distributed on an "AS IS" BASIS, | |
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
# See the License for the specific language governing permissions and | |
# limitations under the License. | |
from typing import Callable, List, Optional, Tuple | |
import flax | |
import flax.linen as nn | |
import jax | |
import jax.numpy as jnp | |
import numpy as np | |
from flax.core.frozen_dict import FrozenDict, freeze, unfreeze | |
from flax.linen.attention import dot_product_attention_weights | |
from flax.traverse_util import flatten_dict, unflatten_dict | |
from ...modeling_flax_outputs import ( | |
FlaxBaseModelOutput, | |
FlaxBaseModelOutputWithPooling, | |
FlaxMaskedLMOutput, | |
FlaxSequenceClassifierOutput, | |
) | |
from ...modeling_flax_utils import ( | |
ACT2FN, | |
FlaxPreTrainedModel, | |
append_replace_return_docstrings, | |
overwrite_call_docstring, | |
) | |
from ...utils import add_start_docstrings, add_start_docstrings_to_model_forward | |
from .configuration_beit import BeitConfig | |
class FlaxBeitModelOutputWithPooling(FlaxBaseModelOutputWithPooling): | |
""" | |
Class for outputs of [`FlaxBeitModel`]. | |
Args: | |
last_hidden_state (`jnp.ndarray` of shape `(batch_size, sequence_length, hidden_size)`): | |
Sequence of hidden-states at the output of the last layer of the model. | |
pooler_output (`jnp.ndarray` of shape `(batch_size, hidden_size)`): | |
Average of the last layer hidden states of the patch tokens (excluding the *[CLS]* token) if | |
*config.use_mean_pooling* is set to True. If set to False, then the final hidden state of the *[CLS]* token | |
will be returned. | |
hidden_states (`tuple(jnp.ndarray)`, *optional*, returned when `output_hidden_states=True` is passed or when `config.output_hidden_states=True`): | |
Tuple of `jnp.ndarray` (one for the output of the embeddings + 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 initial embedding outputs. | |
attentions (`tuple(jnp.ndarray)`, *optional*, returned when `output_attentions=True` is passed or when `config.output_attentions=True`): | |
Tuple of `jnp.ndarray` (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. | |
""" | |
BEIT_START_DOCSTRING = r""" | |
This model inherits from [`FlaxPreTrainedModel`]. Check the superclass documentation for the generic methods the | |
library implements for all its model (such as downloading, saving and converting weights from PyTorch models) | |
This model is also a Flax Linen [flax.linen.Module](https://flax.readthedocs.io/en/latest/flax.linen.html#module) | |
subclass. Use it as a regular Flax linen Module and refer to the Flax documentation for all matter related to | |
general usage and behavior. | |
Finally, this model supports inherent JAX features such as: | |
- [Just-In-Time (JIT) compilation](https://jax.readthedocs.io/en/latest/jax.html#just-in-time-compilation-jit) | |
- [Automatic Differentiation](https://jax.readthedocs.io/en/latest/jax.html#automatic-differentiation) | |
- [Vectorization](https://jax.readthedocs.io/en/latest/jax.html#vectorization-vmap) | |
- [Parallelization](https://jax.readthedocs.io/en/latest/jax.html#parallelization-pmap) | |
Parameters: | |
config ([`BeitConfig`]): 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 [`~FlaxPreTrainedModel.from_pretrained`] method to load the model weights. | |
dtype (`jax.numpy.dtype`, *optional*, defaults to `jax.numpy.float32`): | |
The data type of the computation. Can be one of `jax.numpy.float32`, `jax.numpy.float16` (on GPUs) and | |
`jax.numpy.bfloat16` (on TPUs). | |
This can be used to enable mixed-precision training or half-precision inference on GPUs or TPUs. If | |
specified all the computation will be performed with the given `dtype`. | |
**Note that this only specifies the dtype of the computation and does not influence the dtype of model | |
parameters.** | |
If you wish to change the dtype of the model parameters, see [`~FlaxPreTrainedModel.to_fp16`] and | |
[`~FlaxPreTrainedModel.to_bf16`]. | |
""" | |
BEIT_INPUTS_DOCSTRING = r""" | |
Args: | |
pixel_values (`numpy.ndarray` of shape `(batch_size, num_channels, height, width)`): | |
Pixel values. Pixel values can be obtained using [`AutoImageProcessor`]. See | |
[`AutoImageProcessor.__call__`] for details. | |
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. | |
return_dict (`bool`, *optional*): | |
Whether or not to return a [`~utils.ModelOutput`] instead of a plain tuple. | |
""" | |
def relative_position_index_init(window_size: Tuple[int, int]) -> jnp.ndarray: | |
""" | |
get pair-wise relative position index for each token inside the window | |
""" | |
num_relative_distance = (2 * window_size[0] - 1) * (2 * window_size[1] - 1) + 3 | |
coords_h = np.arange(window_size[0]) | |
coords_w = np.arange(window_size[1]) | |
coords = np.stack(np.meshgrid(coords_h, coords_w, indexing="ij")) # 2, Wh, Ww | |
coords_flatten = np.reshape(coords, (2, -1)) | |
relative_coords = coords_flatten[:, :, None] - coords_flatten[:, None, :] # 2, Wh*Ww, Wh*Ww | |
relative_coords = np.transpose(relative_coords, (1, 2, 0)) # Wh*Ww, Wh*Ww, 2 | |
relative_coords[:, :, 0] += window_size[0] - 1 # shift to start from 0 | |
relative_coords[:, :, 1] += window_size[1] - 1 | |
relative_coords[:, :, 0] *= 2 * window_size[1] - 1 | |
relative_position_index = np.zeros(shape=(window_size[0] * window_size[1] + 1,) * 2, dtype=relative_coords.dtype) | |
relative_position_index[1:, 1:] = relative_coords.sum(-1) # Wh*Ww, Wh*Ww | |
relative_position_index[0, 0:] = num_relative_distance - 3 | |
relative_position_index[0:, 0] = num_relative_distance - 2 | |
relative_position_index[0, 0] = num_relative_distance - 1 | |
return jnp.array(relative_position_index) | |
def ones_with_scale(key, shape, scale, dtype=jnp.float32): | |
return jnp.ones(shape, dtype) * scale | |
class FlaxBeitDropPath(nn.Module): | |
"""Drop paths (Stochastic Depth) per sample (when applied in main path of residual blocks).""" | |
rate: float | |
def __call__(self, inputs, deterministic: Optional[bool] = True): | |
if self.rate == 0.0: | |
return inputs | |
keep_prob = 1.0 - self.rate | |
if deterministic: | |
return inputs | |
else: | |
shape = (inputs.shape[0],) + (1,) * (inputs.ndim - 1) # work with diff dim tensors, not just 2D ConvNets | |
rng = self.make_rng("droppath") | |
random_tensor = keep_prob + jax.random.uniform(rng, shape=shape, dtype=inputs.dtype) | |
binary_tensor = jnp.floor(random_tensor) | |
output = inputs / keep_prob * binary_tensor | |
return output | |
class FlaxBeitPatchEmbeddings(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.num_channels = self.config.num_channels | |
image_size = self.config.image_size | |
patch_size = self.config.patch_size | |
num_patches = (image_size // patch_size) * (image_size // patch_size) | |
patch_shape = (image_size // patch_size, image_size // patch_size) | |
self.num_patches = num_patches | |
self.patch_shape = patch_shape | |
self.projection = nn.Conv( | |
self.config.hidden_size, | |
kernel_size=(patch_size, patch_size), | |
strides=(patch_size, patch_size), | |
padding="VALID", | |
dtype=self.dtype, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
) | |
def __call__(self, pixel_values): | |
num_channels = pixel_values.shape[-1] | |
if num_channels != self.num_channels: | |
raise ValueError( | |
"Make sure that the channel dimension of the pixel values match with the one set in the configuration." | |
) | |
embeddings = self.projection(pixel_values) | |
batch_size, _, _, channels = embeddings.shape | |
return jnp.reshape(embeddings, (batch_size, -1, channels)) | |
class FlaxBeitEmbeddings(nn.Module): | |
"""Construct the CLS token, position and patch embeddings.""" | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.cls_token = self.param("cls_token", nn.initializers.zeros, (1, 1, self.config.hidden_size)) | |
if self.config.use_mask_token: | |
self.mask_token = self.param("mask_token", nn.initializers.zeros, (1, 1, self.config.hidden_size)) | |
self.patch_embeddings = FlaxBeitPatchEmbeddings(self.config, dtype=self.dtype) | |
num_patches = self.patch_embeddings.num_patches | |
if self.config.use_absolute_position_embeddings: | |
self.position_embeddings = self.param( | |
"position_embeddings", nn.initializers.zeros, (1, num_patches + 1, self.config.hidden_size) | |
) | |
self.dropout = nn.Dropout(rate=self.config.hidden_dropout_prob) | |
def __call__(self, pixel_values, bool_masked_pos=None, deterministic=True): | |
embeddings = self.patch_embeddings(pixel_values) | |
batch_size, seq_len, _ = embeddings.shape | |
cls_tokens = jnp.broadcast_to(self.cls_token, (batch_size, 1, self.config.hidden_size)) | |
cls_tokens = cls_tokens.astype(embeddings.dtype) | |
if bool_masked_pos is not None: | |
mask_tokens = jnp.broadcast_to(self.mask_token, (batch_size, seq_len, self.config.hidden_size)) | |
mask_tokens = mask_tokens.astype(embeddings.dtype) | |
# replace the masked visual tokens by mask_tokens | |
w = jnp.expand_dims(bool_masked_pos, axis=-1) | |
embeddings = embeddings * (1 - w) + mask_tokens * w | |
embeddings = jnp.concatenate((cls_tokens, embeddings), axis=1) | |
if self.config.use_absolute_position_embeddings: | |
embeddings = embeddings + self.position_embeddings.astype(embeddings.dtype) | |
embeddings = self.dropout(embeddings, deterministic=deterministic) | |
return embeddings | |
class FlaxBeitRelativePositionBias(nn.Module): | |
config: BeitConfig | |
window_size: Tuple[int, int] | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
num_relative_distance = (2 * self.window_size[0] - 1) * (2 * self.window_size[1] - 1) + 3 | |
self.relative_position_bias_table = self.param( | |
"relative_position_bias_table", | |
nn.initializers.zeros, | |
(num_relative_distance, self.config.num_attention_heads), | |
) # 2*Wh-1 * 2*Ww-1, nH | |
# cls to token & token 2 cls & cls to cls | |
self.relative_position_index = relative_position_index_init(self.window_size) | |
def __call__(self): | |
index = self.relative_position_index.reshape(-1) | |
shape = (self.window_size[0] * self.window_size[1] + 1, self.window_size[0] * self.window_size[1] + 1, -1) | |
relative_position_bias = self.relative_position_bias_table[index].reshape(shape) # Wh*Ww,Wh*Ww,nH | |
return jnp.transpose(relative_position_bias, (2, 0, 1)) | |
class FlaxBeitSelfAttention(nn.Module): | |
config: BeitConfig | |
window_size: Tuple[int, int] | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
if self.config.hidden_size % self.config.num_attention_heads != 0 and not hasattr( | |
self.config, "embedding_size" | |
): | |
raise ValueError( | |
f"The hidden size {self.config.hidden_size,} is not a multiple of the number of attention " | |
f"heads {self.config.num_attention_heads}." | |
) | |
self.query = nn.Dense( | |
self.config.hidden_size, | |
dtype=self.dtype, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
) | |
self.key = nn.Dense( | |
self.config.hidden_size, | |
dtype=self.dtype, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
use_bias=False, | |
) | |
self.value = nn.Dense( | |
self.config.hidden_size, | |
dtype=self.dtype, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
) | |
self.relative_position_bias = ( | |
FlaxBeitRelativePositionBias(self.config, window_size=self.window_size, dtype=self.dtype) | |
if self.window_size | |
else None | |
) | |
def __call__( | |
self, hidden_states, relative_position_bias=None, deterministic: bool = True, output_attentions: bool = False | |
): | |
head_dim = self.config.hidden_size // self.config.num_attention_heads | |
query_states = self.query(hidden_states).reshape( | |
hidden_states.shape[:2] + (self.config.num_attention_heads, head_dim) | |
) | |
value_states = self.value(hidden_states).reshape( | |
hidden_states.shape[:2] + (self.config.num_attention_heads, head_dim) | |
) | |
key_states = self.key(hidden_states).reshape( | |
hidden_states.shape[:2] + (self.config.num_attention_heads, head_dim) | |
) | |
dropout_rng = None | |
if not deterministic and self.config.attention_probs_dropout_prob > 0.0: | |
dropout_rng = self.make_rng("dropout") | |
attention_bias = jnp.array(0.0, dtype=self.dtype) | |
# Add relative position bias if present. | |
if self.relative_position_bias is not None: | |
attention_bias = jnp.expand_dims(self.relative_position_bias(), 0) | |
attention_bias = attention_bias.astype(query_states.dtype) | |
# Add shared relative position bias if provided. | |
if relative_position_bias is not None: | |
attention_bias = attention_bias + relative_position_bias.astype(attention_bias.dtype) | |
attn_weights = dot_product_attention_weights( | |
query_states, | |
key_states, | |
bias=attention_bias, | |
dropout_rng=dropout_rng, | |
dropout_rate=self.config.attention_probs_dropout_prob, | |
broadcast_dropout=True, | |
deterministic=deterministic, | |
dtype=self.dtype, | |
precision=None, | |
) | |
attn_output = jnp.einsum("...hqk,...khd->...qhd", attn_weights, value_states) | |
attn_output = attn_output.reshape(attn_output.shape[:2] + (-1,)) | |
outputs = (attn_output, attn_weights) if output_attentions else (attn_output,) | |
return outputs | |
class FlaxBeitSelfOutput(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.dense = nn.Dense( | |
self.config.hidden_size, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
dtype=self.dtype, | |
) | |
self.dropout = nn.Dropout(rate=self.config.hidden_dropout_prob) | |
def __call__(self, hidden_states, deterministic: bool = True): | |
hidden_states = self.dense(hidden_states) | |
hidden_states = self.dropout(hidden_states, deterministic=deterministic) | |
return hidden_states | |
class FlaxBeitAttention(nn.Module): | |
config: BeitConfig | |
window_size: Tuple[int, int] | |
dtype: jnp.dtype = jnp.float32 | |
def setup(self): | |
self.attention = FlaxBeitSelfAttention(self.config, self.window_size, dtype=self.dtype) | |
self.output = FlaxBeitSelfOutput(self.config, dtype=self.dtype) | |
def __call__( | |
self, hidden_states, relative_position_bias=None, deterministic=True, output_attentions: bool = False | |
): | |
attn_outputs = self.attention( | |
hidden_states, relative_position_bias, deterministic=deterministic, output_attentions=output_attentions | |
) | |
attn_output = attn_outputs[0] | |
attn_output = self.output(attn_output, deterministic=deterministic) | |
outputs = (attn_output,) | |
if output_attentions: | |
outputs += (attn_outputs[1],) | |
return outputs | |
class FlaxBeitIntermediate(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.dense = nn.Dense( | |
self.config.intermediate_size, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
dtype=self.dtype, | |
) | |
self.activation = ACT2FN[self.config.hidden_act] | |
def __call__(self, hidden_states): | |
hidden_states = self.dense(hidden_states) | |
hidden_states = self.activation(hidden_states) | |
return hidden_states | |
class FlaxBeitOutput(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.dense = nn.Dense( | |
self.config.hidden_size, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
dtype=self.dtype, | |
) | |
self.dropout = nn.Dropout(rate=self.config.hidden_dropout_prob) | |
def __call__(self, hidden_states, deterministic: bool = True): | |
hidden_states = self.dense(hidden_states) | |
hidden_states = self.dropout(hidden_states, deterministic=deterministic) | |
return hidden_states | |
class FlaxBeitLayer(nn.Module): | |
config: BeitConfig | |
window_size: Tuple[int, int] | |
drop_path_rate: float | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.attention = FlaxBeitAttention(self.config, self.window_size, dtype=self.dtype) | |
self.intermediate = FlaxBeitIntermediate(self.config, dtype=self.dtype) | |
self.output = FlaxBeitOutput(self.config, dtype=self.dtype) | |
self.layernorm_before = nn.LayerNorm(epsilon=self.config.layer_norm_eps, dtype=self.dtype) | |
self.drop_path = FlaxBeitDropPath(rate=self.drop_path_rate) | |
self.layernorm_after = nn.LayerNorm(epsilon=self.config.layer_norm_eps, dtype=self.dtype) | |
self.init_values = self.config.layer_scale_init_value | |
if self.init_values > 0: | |
self.lambda_1 = self.param("lambda_1", ones_with_scale, (self.config.hidden_size), self.init_values) | |
self.lambda_2 = self.param("lambda_2", ones_with_scale, (self.config.hidden_size), self.init_values) | |
else: | |
self.lambda_1 = None | |
self.lambda_2 = None | |
def __call__( | |
self, hidden_states, relative_position_bias=None, deterministic: bool = True, output_attentions: bool = False | |
): | |
self_attention_outputs = self.attention( | |
self.layernorm_before(hidden_states), # in BEiT, layernorm is applied before self-attention | |
relative_position_bias, | |
deterministic=deterministic, | |
output_attentions=output_attentions, | |
) | |
attention_output = self_attention_outputs[0] | |
# apply lambda_1 if present | |
if self.lambda_1 is not None: | |
attention_output = self.lambda_1.astype(attention_output.dtype) * attention_output | |
# first residual connection | |
hidden_states = self.drop_path(attention_output, deterministic=deterministic) + hidden_states | |
# in BEiT, layernorm is also applied after self-attention | |
layer_output = self.layernorm_after(hidden_states) | |
layer_output = self.intermediate(layer_output) | |
layer_output = self.output(layer_output, deterministic=deterministic) | |
# apply lambda_2 if present | |
if self.lambda_2 is not None: | |
layer_output = self.lambda_2.astype(layer_output.dtype) * layer_output | |
# second residual connection | |
layer_output = self.drop_path(layer_output, deterministic=deterministic) + hidden_states | |
outputs = (layer_output,) | |
if output_attentions: | |
outputs += (self_attention_outputs[1],) | |
return outputs | |
class FlaxBeitLayerCollection(nn.Module): | |
config: BeitConfig | |
window_size: Tuple[int, int] | |
drop_path_rates: List[float] | |
relative_position_bias: Callable[[], jnp.ndarray] | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.layers = [ | |
FlaxBeitLayer( | |
self.config, | |
window_size=self.window_size if self.config.use_relative_position_bias else None, | |
drop_path_rate=self.drop_path_rates[i], | |
name=str(i), | |
dtype=self.dtype, | |
) | |
for i in range(self.config.num_hidden_layers) | |
] | |
def __call__( | |
self, | |
hidden_states, | |
deterministic: bool = True, | |
output_attentions: bool = False, | |
output_hidden_states: bool = False, | |
return_dict: bool = True, | |
): | |
all_attentions = () if output_attentions else None | |
all_hidden_states = () if output_hidden_states else None | |
for i, layer in enumerate(self.layers): | |
if output_hidden_states: | |
all_hidden_states += (hidden_states,) | |
relative_position_bias = self.relative_position_bias() if self.relative_position_bias is not None else None | |
layer_outputs = layer( | |
hidden_states, relative_position_bias, deterministic=deterministic, output_attentions=output_attentions | |
) | |
hidden_states = layer_outputs[0] | |
if output_attentions: | |
all_attentions += (layer_outputs[1],) | |
if output_hidden_states: | |
all_hidden_states += (hidden_states,) | |
outputs = (hidden_states,) | |
if not return_dict: | |
return tuple(v for v in outputs if v is not None) | |
return FlaxBaseModelOutput( | |
last_hidden_state=hidden_states, hidden_states=all_hidden_states, attentions=all_attentions | |
) | |
class FlaxBeitEncoder(nn.Module): | |
config: BeitConfig | |
window_size: Tuple[int, int] | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
if self.config.use_shared_relative_position_bias: | |
self.relative_position_bias = FlaxBeitRelativePositionBias( | |
config=self.config, window_size=self.window_size, dtype=self.dtype | |
) | |
# stochastic depth decay rule | |
drop_path_rates = list(np.linspace(0, self.config.drop_path_rate, self.config.num_hidden_layers)) | |
self.layer = FlaxBeitLayerCollection( | |
self.config, | |
window_size=self.window_size, | |
drop_path_rates=drop_path_rates, | |
relative_position_bias=self.relative_position_bias | |
if self.config.use_shared_relative_position_bias | |
else None, | |
dtype=self.dtype, | |
) | |
def __call__( | |
self, | |
hidden_states, | |
deterministic: bool = True, | |
output_attentions: bool = False, | |
output_hidden_states: bool = False, | |
return_dict: bool = True, | |
): | |
return self.layer( | |
hidden_states, | |
deterministic=deterministic, | |
output_attentions=output_attentions, | |
output_hidden_states=output_hidden_states, | |
return_dict=return_dict, | |
) | |
class FlaxBeitPreTrainedModel(FlaxPreTrainedModel): | |
""" | |
An abstract class to handle weights initialization and a simple interface for downloading and loading pretrained | |
models. | |
""" | |
config_class = BeitConfig | |
base_model_prefix = "beit" | |
main_input_name = "pixel_values" | |
module_class: nn.Module = None | |
def __init__( | |
self, | |
config: BeitConfig, | |
input_shape=None, | |
seed: int = 0, | |
dtype: jnp.dtype = jnp.float32, | |
_do_init: bool = True, | |
**kwargs, | |
): | |
module = self.module_class(config=config, dtype=dtype, **kwargs) | |
if input_shape is None: | |
input_shape = (1, config.image_size, config.image_size, config.num_channels) | |
super().__init__(config, module, input_shape=input_shape, seed=seed, dtype=dtype, _do_init=_do_init) | |
def init_weights(self, rng: jax.random.PRNGKey, input_shape: Tuple, params: FrozenDict = None) -> FrozenDict: | |
# init input tensors | |
pixel_values = jnp.zeros(input_shape, dtype=self.dtype) | |
params_rng, dropout_rng = jax.random.split(rng) | |
dropout_rng, droppath_rng = jax.random.split(dropout_rng) | |
rngs = {"params": params_rng, "dropout": dropout_rng, "droppath": droppath_rng} | |
random_params = self.module.init(rngs, pixel_values, return_dict=False)["params"] | |
if params is not None: | |
random_params = flatten_dict(unfreeze(random_params)) | |
params = flatten_dict(unfreeze(params)) | |
for missing_key in self._missing_keys: | |
params[missing_key] = random_params[missing_key] | |
self._missing_keys = set() | |
return freeze(unflatten_dict(params)) | |
else: | |
return random_params | |
def __call__( | |
self, | |
pixel_values, | |
bool_masked_pos=None, | |
params: dict = None, | |
dropout_rng: jax.random.PRNGKey = None, | |
train: bool = False, | |
output_attentions: Optional[bool] = None, | |
output_hidden_states: Optional[bool] = None, | |
return_dict: Optional[bool] = None, | |
): | |
output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions | |
output_hidden_states = ( | |
output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states | |
) | |
return_dict = return_dict if return_dict is not None else self.config.return_dict | |
pixel_values = jnp.transpose(pixel_values, (0, 2, 3, 1)) | |
# Handle any PRNG if needed | |
rngs = {} | |
if dropout_rng is not None: | |
dropout_rng, droppath_rng = jax.random.split(dropout_rng) | |
rngs["dropout"] = dropout_rng | |
rngs["droppath"] = droppath_rng | |
return self.module.apply( | |
{"params": params or self.params}, | |
jnp.array(pixel_values, dtype=jnp.float32), | |
bool_masked_pos, | |
not train, | |
output_attentions, | |
output_hidden_states, | |
return_dict, | |
rngs=rngs, | |
) | |
class FlaxBeitPooler(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
if self.config.use_mean_pooling: | |
self.layernorm = nn.LayerNorm(epsilon=self.config.layer_norm_eps, dtype=self.dtype) | |
def __call__(self, hidden_states): | |
if self.config.use_mean_pooling: | |
# Mean pool the final hidden states of the patch tokens | |
patch_tokens = hidden_states[:, 1:, :] | |
pooled_output = self.layernorm(jnp.mean(patch_tokens, axis=1)) | |
else: | |
# Pool by simply taking the final hidden state of the [CLS] token | |
pooled_output = hidden_states[:, 0] | |
return pooled_output | |
class FlaxBeitModule(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
add_pooling_layer: bool = True | |
def setup(self): | |
self.embeddings = FlaxBeitEmbeddings(self.config, dtype=self.dtype) | |
self.encoder = FlaxBeitEncoder( | |
self.config, window_size=self.embeddings.patch_embeddings.patch_shape, dtype=self.dtype | |
) | |
if not self.config.use_mean_pooling: | |
self.layernorm = nn.LayerNorm(epsilon=self.config.layer_norm_eps, dtype=self.dtype) | |
self.pooler = FlaxBeitPooler(self.config, dtype=self.dtype) if self.add_pooling_layer else None | |
def __call__( | |
self, | |
pixel_values, | |
bool_masked_pos=None, | |
deterministic: bool = True, | |
output_attentions: bool = False, | |
output_hidden_states: bool = False, | |
return_dict: bool = True, | |
): | |
hidden_states = self.embeddings(pixel_values, bool_masked_pos, deterministic=deterministic) | |
outputs = self.encoder( | |
hidden_states, | |
deterministic=deterministic, | |
output_attentions=output_attentions, | |
output_hidden_states=output_hidden_states, | |
return_dict=return_dict, | |
) | |
hidden_states = outputs[0] | |
if not self.config.use_mean_pooling: | |
hidden_states = self.layernorm(hidden_states) | |
pooled = self.pooler(hidden_states) if self.add_pooling_layer else None | |
if not return_dict: | |
# if pooled is None, don't return it | |
if pooled is None: | |
return (hidden_states,) + outputs[1:] | |
return (hidden_states, pooled) + outputs[1:] | |
return FlaxBeitModelOutputWithPooling( | |
last_hidden_state=hidden_states, | |
pooler_output=pooled, | |
hidden_states=outputs.hidden_states, | |
attentions=outputs.attentions, | |
) | |
class FlaxBeitModel(FlaxBeitPreTrainedModel): | |
module_class = FlaxBeitModule | |
FLAX_BEIT_MODEL_DOCSTRING = """ | |
Returns: | |
Examples: | |
```python | |
>>> from transformers import AutoImageProcessor, FlaxBeitModel | |
>>> from PIL import Image | |
>>> import requests | |
>>> url = "http://images.cocodataset.org/val2017/000000039769.jpg" | |
>>> image = Image.open(requests.get(url, stream=True).raw) | |
>>> image_processor = AutoImageProcessor.from_pretrained("microsoft/beit-base-patch16-224-pt22k-ft22k") | |
>>> model = FlaxBeitModel.from_pretrained("microsoft/beit-base-patch16-224-pt22k-ft22k") | |
>>> inputs = image_processor(images=image, return_tensors="np") | |
>>> outputs = model(**inputs) | |
>>> last_hidden_states = outputs.last_hidden_state | |
``` | |
""" | |
overwrite_call_docstring(FlaxBeitModel, FLAX_BEIT_MODEL_DOCSTRING) | |
append_replace_return_docstrings(FlaxBeitModel, output_type=FlaxBeitModelOutputWithPooling, config_class=BeitConfig) | |
class FlaxBeitForMaskedImageModelingModule(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 # the dtype of the computation | |
def setup(self): | |
self.beit = FlaxBeitModule(self.config, add_pooling_layer=False, dtype=self.dtype) | |
# Classifier head | |
self.layernorm = nn.LayerNorm(epsilon=self.config.layer_norm_eps, dtype=self.dtype) | |
self.lm_head = nn.Dense( | |
self.config.vocab_size, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
dtype=self.dtype, | |
) | |
def __call__( | |
self, | |
pixel_values=None, | |
bool_masked_pos=None, | |
deterministic: bool = True, | |
output_attentions=None, | |
output_hidden_states=None, | |
return_dict=None, | |
): | |
return_dict = return_dict if return_dict is not None else self.config.use_return_dict | |
outputs = self.beit( | |
pixel_values, | |
bool_masked_pos, | |
deterministic=deterministic, | |
output_attentions=output_attentions, | |
output_hidden_states=output_hidden_states, | |
return_dict=return_dict, | |
) | |
sequence_output = outputs[0] | |
sequence_output = self.layernorm(sequence_output) | |
prediction_scores = self.lm_head(sequence_output[:, 1:]) | |
if not return_dict: | |
output = (prediction_scores,) + outputs[2:] | |
return output | |
return FlaxMaskedLMOutput( | |
logits=prediction_scores, | |
hidden_states=outputs.hidden_states, | |
attentions=outputs.attentions, | |
) | |
class FlaxBeitForMaskedImageModeling(FlaxBeitPreTrainedModel): | |
module_class = FlaxBeitForMaskedImageModelingModule | |
FLAX_BEIT_MLM_DOCSTRING = """ | |
bool_masked_pos (`numpy.ndarray` of shape `(batch_size, num_patches)`): | |
Boolean masked positions. Indicates which patches are masked (1) and which aren't (0). | |
Returns: | |
Examples: | |
```python | |
>>> from transformers import AutoImageProcessor, BeitForMaskedImageModeling | |
>>> from PIL import Image | |
>>> import requests | |
>>> url = "http://images.cocodataset.org/val2017/000000039769.jpg" | |
>>> image = Image.open(requests.get(url, stream=True).raw) | |
>>> image_processor = AutoImageProcessor.from_pretrained("microsoft/beit-base-patch16-224-pt22k") | |
>>> model = BeitForMaskedImageModeling.from_pretrained("microsoft/beit-base-patch16-224-pt22k") | |
>>> inputs = image_processor(images=image, return_tensors="np") | |
>>> outputs = model(**inputs) | |
>>> logits = outputs.logits | |
``` | |
""" | |
overwrite_call_docstring(FlaxBeitForMaskedImageModeling, FLAX_BEIT_MLM_DOCSTRING) | |
append_replace_return_docstrings( | |
FlaxBeitForMaskedImageModeling, output_type=FlaxMaskedLMOutput, config_class=BeitConfig | |
) | |
class FlaxBeitForImageClassificationModule(nn.Module): | |
config: BeitConfig | |
dtype: jnp.dtype = jnp.float32 | |
def setup(self): | |
self.beit = FlaxBeitModule(config=self.config, dtype=self.dtype, add_pooling_layer=True) | |
self.classifier = nn.Dense( | |
self.config.num_labels, | |
kernel_init=jax.nn.initializers.normal(self.config.initializer_range), | |
dtype=self.dtype, | |
) | |
def __call__( | |
self, | |
pixel_values=None, | |
bool_masked_pos=None, | |
deterministic: bool = True, | |
output_attentions=None, | |
output_hidden_states=None, | |
return_dict=None, | |
): | |
return_dict = return_dict if return_dict is not None else self.config.use_return_dict | |
outputs = self.beit( | |
pixel_values, | |
deterministic=deterministic, | |
output_attentions=output_attentions, | |
output_hidden_states=output_hidden_states, | |
return_dict=return_dict, | |
) | |
pooled_output = outputs[1] | |
logits = self.classifier(pooled_output) | |
if not return_dict: | |
output = (logits,) + outputs[2:] | |
return output | |
return FlaxSequenceClassifierOutput( | |
logits=logits, | |
hidden_states=outputs.hidden_states, | |
attentions=outputs.attentions, | |
) | |
class FlaxBeitForImageClassification(FlaxBeitPreTrainedModel): | |
module_class = FlaxBeitForImageClassificationModule | |
FLAX_BEIT_CLASSIF_DOCSTRING = """ | |
Returns: | |
Example: | |
```python | |
>>> from transformers import AutoImageProcessor, FlaxBeitForImageClassification | |
>>> from PIL import Image | |
>>> import requests | |
>>> url = "http://images.cocodataset.org/val2017/000000039769.jpg" | |
>>> image = Image.open(requests.get(url, stream=True).raw) | |
>>> image_processor = AutoImageProcessor.from_pretrained("microsoft/beit-base-patch16-224") | |
>>> model = FlaxBeitForImageClassification.from_pretrained("microsoft/beit-base-patch16-224") | |
>>> inputs = image_processor(images=image, return_tensors="np") | |
>>> outputs = model(**inputs) | |
>>> logits = outputs.logits | |
>>> # model predicts one of the 1000 ImageNet classes | |
>>> predicted_class_idx = logits.argmax(-1).item() | |
>>> print("Predicted class:", model.config.id2label[predicted_class_idx]) | |
``` | |
""" | |
overwrite_call_docstring(FlaxBeitForImageClassification, FLAX_BEIT_CLASSIF_DOCSTRING) | |
append_replace_return_docstrings( | |
FlaxBeitForImageClassification, output_type=FlaxSequenceClassifierOutput, config_class=BeitConfig | |
) | |