[Flax BERT/Roberta] few small fixes (#11558)

* small fixes

* style

src/transformers/models/bert/modeling_flax_bert.py

@@ -25,7 +25,6 @@ import jaxlib.xla_extension as jax_xla
 from flax.core.frozen_dict import FrozenDict
 from flax.linen import dot_product_attention
 from jax import lax
-from jax.random import PRNGKey
 
 from ...file_utils import ModelOutput, add_start_docstrings, add_start_docstrings_to_model_forward
 from ...modeling_flax_outputs import (
@@ -92,9 +91,9 @@ BERT_START_DOCSTRING = r"""
     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.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.
+    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:
 
@@ -106,8 +105,8 @@ BERT_START_DOCSTRING = r"""
     Parameters:
         config (:class:`~transformers.BertConfig`): 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 :meth:`~transformers.PreTrainedModel.from_pretrained` method to load the model
-            weights.
+            configuration. Check out the :meth:`~transformers.FlaxPreTrainedModel.from_pretrained` method to load the
+            model weights.
 """
 
 BERT_INPUTS_DOCSTRING = r"""
@@ -173,7 +172,6 @@ class FlaxBertEmbeddings(nn.Module):
         self.dropout = nn.Dropout(rate=self.config.hidden_dropout_prob)
 
     def __call__(self, input_ids, token_type_ids, position_ids, attention_mask, deterministic: bool = True):
-        batch_size, sequence_length = input_ids.shape
         # Embed
         inputs_embeds = self.word_embeddings(input_ids.astype("i4"))
         position_embeds = self.position_embeddings(position_ids.astype("i4"))
@@ -181,7 +179,6 @@ class FlaxBertEmbeddings(nn.Module):
 
         # Sum all embeddings
         hidden_states = inputs_embeds + token_type_embeddings + position_embeds
-        #        hidden_states = hidden_states.reshape((batch_size, sequence_length, -1))
 
         # Layer Norm
         hidden_states = self.LayerNorm(hidden_states)
@@ -571,7 +568,7 @@ class FlaxBertPreTrainedModel(FlaxPreTrainedModel):
         token_type_ids=None,
         position_ids=None,
         params: dict = None,
-        dropout_rng: PRNGKey = None,
+        dropout_rng: jax.random.PRNGKey = None,
         train: bool = False,
         output_attentions: Optional[bool] = None,
         output_hidden_states: Optional[bool] = None,

src/transformers/models/roberta/modeling_flax_roberta.py

@@ -59,9 +59,9 @@ ROBERTA_START_DOCSTRING = r"""
     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.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.
+    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:
 
@@ -73,8 +73,8 @@ ROBERTA_START_DOCSTRING = r"""
     Parameters:
         config (:class:`~transformers.RobertaConfig`): 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 :meth:`~transformers.PreTrainedModel.from_pretrained` method to load the model
-            weights.
+            configuration. Check out the :meth:`~transformers.FlaxPreTrainedModel.from_pretrained` method to load the
+            model weights.
 """
 
 ROBERTA_INPUTS_DOCSTRING = r"""
@@ -140,7 +140,6 @@ class FlaxRobertaEmbeddings(nn.Module):
         self.dropout = nn.Dropout(rate=self.config.hidden_dropout_prob)
 
     def __call__(self, input_ids, token_type_ids, position_ids, attention_mask, deterministic: bool = True):
-        batch_size, sequence_length = input_ids.shape
         # Embed
         inputs_embeds = self.word_embeddings(input_ids.astype("i4"))
         position_embeds = self.position_embeddings(position_ids.astype("i4"))
@@ -148,7 +147,6 @@ class FlaxRobertaEmbeddings(nn.Module):
 
         # Sum all embeddings
         hidden_states = inputs_embeds + token_type_embeddings + position_embeds
-        #        hidden_states = hidden_states.reshape((batch_size, sequence_length, -1))
 
         # Layer Norm
         hidden_states = self.LayerNorm(hidden_states)