Flax/Jax documentation (#8331)

* First addition of Flax/Jax documentation
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* make style

* Ensure input order match between Bert & Roberta
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* Install dependencies "all" when building doc
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* wraps build_doc deps with ""
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* Addressing @sgugger comments.
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* Use list to highlight JAX features.
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* Make style.
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* Let's not look to much into the future for now.
Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

* Style
Co-authored-by: Lysandre <lysandre.debut@reseau.eseo.fr>

.circleci/config.yml

@@ -281,7 +281,7 @@ jobs:
                       - v0.4-build_doc-{{ checksum "setup.py" }}
                       - v0.4-{{ checksum "setup.py" }}
             - run: pip install --upgrade pip
-            - run: pip install .[tf,torch,sentencepiece,docs]
+            - run: pip install ."[all, docs]"
             - save_cache:
                   key: v0.4-build_doc-{{ checksum "setup.py" }}
                   paths:

docs/source/model_doc/bert.rst

@@ -188,3 +188,10 @@ TFBertForQuestionAnswering
 
 .. autoclass:: transformers.TFBertForQuestionAnswering
     :members: call
+
+
+FlaxBertModel
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: transformers.FlaxBertModel
+    :members: __call__

docs/source/model_doc/roberta.rst

@@ -146,3 +146,10 @@ TFRobertaForQuestionAnswering
 
 .. autoclass:: transformers.TFRobertaForQuestionAnswering
     :members: call
+
+
+FlaxRobertaModel
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: transformers.FlaxRobertaModel
+    :members: __call__

src/transformers/modeling_flax_bert.py

@@ -22,7 +22,7 @@ import jax
 import jax.numpy as jnp
 
 from .configuration_bert import BertConfig
-from .file_utils import add_start_docstrings
+from .file_utils import add_start_docstrings, add_start_docstrings_to_model_forward
 from .modeling_flax_utils import FlaxPreTrainedModel, gelu
 from .utils import logging
 
@@ -35,13 +35,20 @@ _TOKENIZER_FOR_DOC = "BertTokenizer"
 
 BERT_START_DOCSTRING = r"""
 
-    This model inherits from :class:`~transformers.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 inherits from :class:`~transformers.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 PyTorch `torch.nn.Module <https://pytorch.org/docs/stable/nn.html#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.
+    This model is also a Flax Linen `flax.nn.Module
+    <https://flax.readthedocs.io/en/latest/_autosummary/flax.nn.module.html>`__ subclass. Use it as a regular Flax
+    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 (:class:`~transformers.BertConfig`): Model configuration class with all the parameters of the model.
@@ -52,50 +59,32 @@ BERT_START_DOCSTRING = r"""
 
 BERT_INPUTS_DOCSTRING = r"""
     Args:
-        input_ids (:obj:`torch.LongTensor` of shape :obj:`({0})`):
+        input_ids (:obj:`numpy.ndarray` of shape :obj:`({0})`):
             Indices of input sequence tokens in the vocabulary.
 
             Indices can be obtained using :class:`~transformers.BertTokenizer`. See
-            :meth:`transformers.PreTrainedTokenizer.encode` and :meth:`transformers.PreTrainedTokenizer.__call__` for
+            :meth:`transformers.PreTrainedTokenizer.encode` and :func:`transformers.PreTrainedTokenizer.__call__` for
             details.
 
             `What are input IDs? <../glossary.html#input-ids>`__
-        attention_mask (:obj:`torch.FloatTensor` of shape :obj:`({0})`, `optional`):
+        attention_mask (:obj:`numpy.ndarray` of shape :obj:`({0})`, `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? <../glossary.html#attention-mask>`__
-        token_type_ids (:obj:`torch.LongTensor` of shape :obj:`({0})`, `optional`):
+        token_type_ids (:obj:`numpy.ndarray` of shape :obj:`({0})`, `optional`):
             Segment token indices to indicate first and second portions of the inputs. Indices are selected in ``[0,
             1]``:
 
             - 0 corresponds to a `sentence A` token,
             - 1 corresponds to a `sentence B` token.
 
-            `What are token type IDs? <../glossary.html#token-type-ids>`_
-        position_ids (:obj:`torch.LongTensor` of shape :obj:`({0})`, `optional`):
+            `What are token type IDs? <../glossary.html#token-type-ids>`__
+        position_ids (:obj:`numpy.ndarray` of shape :obj:`({0})`, `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? <../glossary.html#position-ids>`_
-        head_mask (:obj:`torch.FloatTensor` of shape :obj:`(num_heads,)` or :obj:`(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**.
-
-        inputs_embeds (:obj:`torch.FloatTensor` of shape :obj:`({0}, hidden_size)`, `optional`):
-            Optionally, instead of passing :obj:`input_ids` you can choose to directly pass an embedded representation.
-            This is useful if you want more control over how to convert :obj:`input_ids` indices into associated
-            vectors than the model's internal embedding lookup matrix.
-        output_attentions (:obj:`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 (:obj:`bool`, `optional`):
-            Whether or not to return the hidden states of all layers. See ``hidden_states`` under returned tensors for
-            more detail.
         return_dict (:obj:`bool`, `optional`):
             Whether or not to return a :class:`~transformers.file_utils.ModelOutput` instead of a plain tuple.
 """
@@ -291,7 +280,7 @@ class FlaxBertModule(nn.Module):
     intermediate_size: int
 
     @nn.compact
-    def __call__(self, input_ids, token_type_ids, position_ids, attention_mask):
+    def __call__(self, input_ids, attention_mask, token_type_ids, position_ids):
 
         # Embedding
         embeddings = FlaxBertEmbeddings(
@@ -410,7 +399,8 @@ class FlaxBertModel(FlaxPreTrainedModel):
     def module(self) -> nn.Module:
         return self._module
 
-    def __call__(self, input_ids, token_type_ids=None, position_ids=None, attention_mask=None):
+    @add_start_docstrings_to_model_forward(BERT_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
+    def __call__(self, input_ids, attention_mask=None, token_type_ids=None, position_ids=None):
         if token_type_ids is None:
             token_type_ids = jnp.ones_like(input_ids)
 
@@ -423,7 +413,7 @@ class FlaxBertModel(FlaxPreTrainedModel):
         return self.model.apply(
             {"params": self.params},
             jnp.array(input_ids, dtype="i4"),
+            jnp.array(attention_mask, dtype="i4"),
             jnp.array(token_type_ids, dtype="i4"),
             jnp.array(position_ids, dtype="i4"),
-            jnp.array(attention_mask, dtype="i4"),
         )

src/transformers/modeling_flax_roberta.py

@@ -21,7 +21,7 @@ import jax
 import jax.numpy as jnp
 
 from .configuration_roberta import RobertaConfig
-from .file_utils import add_start_docstrings
+from .file_utils import add_start_docstrings, add_start_docstrings_to_model_forward
 from .modeling_flax_utils import FlaxPreTrainedModel, gelu
 from .utils import logging
 
@@ -34,13 +34,20 @@ _TOKENIZER_FOR_DOC = "RobertaTokenizer"
 
 ROBERTA_START_DOCSTRING = r"""
 
-    This model inherits from :class:`~transformers.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 inherits from :class:`~transformers.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 PyTorch `torch.nn.Module <https://pytorch.org/docs/stable/nn.html#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.
+    This model is also a Flax Linen `flax.nn.Module
+    <https://flax.readthedocs.io/en/latest/_autosummary/flax.nn.module.html>`__ subclass. Use it as a regular Flax
+    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 (:class:`~transformers.RobertaConfig`): Model configuration class with all the parameters of the
@@ -51,50 +58,32 @@ ROBERTA_START_DOCSTRING = r"""
 
 ROBERTA_INPUTS_DOCSTRING = r"""
     Args:
-        input_ids (:obj:`torch.LongTensor` of shape :obj:`({0})`):
+        input_ids (:obj:`numpy.ndarray` of shape :obj:`({0})`):
             Indices of input sequence tokens in the vocabulary.
 
-            Indices can be obtained using :class:`~transformers.RobertaTokenizer`. See
-            :meth:`transformers.PreTrainedTokenizer.encode` and :meth:`transformers.PreTrainedTokenizer.__call__` for
+            Indices can be obtained using :class:`~transformers.BertTokenizer`. See
+            :func:`transformers.PreTrainedTokenizer.encode` and :func:`transformers.PreTrainedTokenizer.__call__` for
             details.
 
             `What are input IDs? <../glossary.html#input-ids>`__
-        attention_mask (:obj:`torch.FloatTensor` of shape :obj:`({0})`, `optional`):
+        attention_mask (:obj:`numpy.ndarray` of shape :obj:`({0})`, `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? <../glossary.html#attention-mask>`__
-        token_type_ids (:obj:`torch.LongTensor` of shape :obj:`({0})`, `optional`):
+        token_type_ids (:obj:`numpy.ndarray` of shape :obj:`({0})`, `optional`):
             Segment token indices to indicate first and second portions of the inputs. Indices are selected in ``[0,
             1]``:
 
             - 0 corresponds to a `sentence A` token,
             - 1 corresponds to a `sentence B` token.
 
-            `What are token type IDs? <../glossary.html#token-type-ids>`_
-        position_ids (:obj:`torch.LongTensor` of shape :obj:`({0})`, `optional`):
+            `What are token type IDs? <../glossary.html#token-type-ids>`__
+        position_ids (:obj:`numpy.ndarray` of shape :obj:`({0})`, `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? <../glossary.html#position-ids>`_
-        head_mask (:obj:`torch.FloatTensor` of shape :obj:`(num_heads,)` or :obj:`(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**.
-
-        inputs_embeds (:obj:`torch.FloatTensor` of shape :obj:`({0}, hidden_size)`, `optional`):
-            Optionally, instead of passing :obj:`input_ids` you can choose to directly pass an embedded representation.
-            This is useful if you want more control over how to convert :obj:`input_ids` indices into associated
-            vectors than the model's internal embedding lookup matrix.
-        output_attentions (:obj:`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 (:obj:`bool`, `optional`):
-            Whether or not to return the hidden states of all layers. See ``hidden_states`` under returned tensors for
-            more detail.
         return_dict (:obj:`bool`, `optional`):
             Whether or not to return a :class:`~transformers.file_utils.ModelOutput` instead of a plain tuple.
 """
@@ -302,7 +291,7 @@ class FlaxRobertaModule(nn.Module):
     intermediate_size: int
 
     @nn.compact
-    def __call__(self, input_ids, token_type_ids, position_ids, attention_mask):
+    def __call__(self, input_ids, attention_mask, token_type_ids, position_ids):
 
         # Embedding
         embeddings = FlaxRobertaEmbeddings(
@@ -421,7 +410,8 @@ class FlaxRobertaModel(FlaxPreTrainedModel):
     def module(self) -> nn.Module:
         return self._module
 
-    def __call__(self, input_ids, token_type_ids=None, position_ids=None, attention_mask=None):
+    @add_start_docstrings_to_model_forward(ROBERTA_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
+    def __call__(self, input_ids, token_type_ids=None, attention_mask=None, position_ids=None):
         if token_type_ids is None:
             token_type_ids = jnp.ones_like(input_ids)
 
@@ -436,7 +426,7 @@ class FlaxRobertaModel(FlaxPreTrainedModel):
         return self.model.apply(
             {"params": self.params},
             jnp.array(input_ids, dtype="i4"),
+            jnp.array(attention_mask, dtype="i4"),
             jnp.array(token_type_ids, dtype="i4"),
             jnp.array(position_ids, dtype="i4"),
-            jnp.array(attention_mask, dtype="i4"),
         )