Remove all references to "begin_training" (#11943)

When v3 was released, `begin_training` was renamed to `initialize`.
There were warnings in the code and docs about that. This PR removes
them.

spacy/errors.py

@@ -131,13 +131,6 @@ class Warnings(metaclass=ErrorsWithCodes):
             "and make it independent. For example, `replace_listeners = "
             "[\"model.tok2vec\"]` See the documentation for details: "
             "https://spacy.io/usage/training#config-components-listeners")
-    W088 = ("The pipeline component {name} implements a `begin_training` "
-            "method, which won't be called by spaCy. As of v3.0, `begin_training` "
-            "has been renamed to `initialize`, so you likely want to rename the "
-            "component method. See the documentation for details: "
-            "https://spacy.io/api/language#initialize")
-    W089 = ("As of spaCy v3.0, the `nlp.begin_training` method has been renamed "
-            "to `nlp.initialize`.")
     W090 = ("Could not locate any {format} files in path '{path}'.")
     W091 = ("Could not clean/remove the temp directory at {dir}: {msg}.")
     W092 = ("Ignoring annotations for sentence starts, as dependency heads are set.")

spacy/language.py

@@ -1239,15 +1239,6 @@ class Language:
             sgd(key, W, dW)  # type: ignore[call-arg, misc]
         return losses
 
-    def begin_training(
-        self,
-        get_examples: Optional[Callable[[], Iterable[Example]]] = None,
-        *,
-        sgd: Optional[Optimizer] = None,
-    ) -> Optimizer:
-        warnings.warn(Warnings.W089, DeprecationWarning)
-        return self.initialize(get_examples, sgd=sgd)
-
     def initialize(
         self,
         get_examples: Optional[Callable[[], Iterable[Example]]] = None,

spacy/pipeline/pipe.pyx

@@ -19,13 +19,6 @@ cdef class Pipe:
     DOCS: https://spacy.io/api/pipe
     """
 
-    @classmethod
-    def __init_subclass__(cls, **kwargs):
-        """Raise a warning if an inheriting class implements 'begin_training'
-         (from v2) instead of the new 'initialize' method (from v3)"""
-        if hasattr(cls, "begin_training"):
-            warnings.warn(Warnings.W088.format(name=cls.__name__))
-
     def __call__(self, Doc doc) -> Doc:
         """Apply the pipe to one document. The document is modified in place,
         and returned. This usually happens under the hood when the nlp object

spacy/tests/pipeline/test_pipe_methods.py

@@ -529,17 +529,6 @@ def test_pipe_label_data_no_labels(pipe):
         assert "labels" not in get_arg_names(initialize)
 
 
-def test_warning_pipe_begin_training():
-    with pytest.warns(UserWarning, match="begin_training"):
-
-        class IncompatPipe(TrainablePipe):
-            def __init__(self):
-                ...
-
-            def begin_training(*args, **kwargs):
-                ...
-
-
 def test_pipe_methods_initialize():
     """Test that the [initialize] config reflects the components correctly."""
     nlp = Language()

website/docs/api/dependencyparser.md

@@ -169,12 +169,6 @@ arguments it receives via the
 [`[initialize.components]`](/api/data-formats#config-initialize) block in the
 config.
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`.
-
-</Infobox>
-
 > #### Example
 >
 > ```python

website/docs/api/entitylinker.md

@@ -200,12 +200,6 @@ knowledge base. This argument should be a function that takes a `Vocab` instance
 and creates the `KnowledgeBase`, ensuring that the strings of the knowledge base
 are synced with the current vocab.
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`.
-
-</Infobox>
-
 > #### Example
 >
 > ```python

website/docs/api/entityrecognizer.md

@@ -165,12 +165,6 @@ arguments it receives via the
 [`[initialize.components]`](/api/data-formats#config-initialize) block in the
 config.
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`.
-
-</Infobox>
-
 > #### Example
 >
 > ```python

website/docs/api/language.md

@@ -259,15 +259,6 @@ either in the [config](/usage/training#config), or by calling
 [`pipe.add_label`](/api/pipe#add_label) for each possible output label (e.g. for
 the tagger or textcat).
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`. It now also takes a
-**function** that is called with no arguments and returns a sequence of
-[`Example`](/api/example) objects instead of tuples of `Doc` and `GoldParse`
-objects.
-
-</Infobox>
-
 > #### Example
 >
 > ```python

website/docs/api/pipe.md

@@ -152,12 +152,6 @@ network,
 setting up the label scheme based on the data. This method is typically called
 by [`Language.initialize`](/api/language#initialize).
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`.
-
-</Infobox>
-
 > #### Example
 >
 > ```python

website/docs/api/tagger.md

@@ -142,12 +142,6 @@ arguments it receives via the
 [`[initialize.components]`](/api/data-formats#config-initialize) block in the
 config.
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`.
-
-</Infobox>
-
 > #### Example
 >
 > ```python

website/docs/api/textcategorizer.md

@@ -187,12 +187,6 @@ arguments it receives via the
 [`[initialize.components]`](/api/data-formats#config-initialize) block in the
 config.
 
-<Infobox variant="warning" title="Changed in v3.0" id="begin_training">
-
-This method was previously called `begin_training`.
-
-</Infobox>
-
 > #### Example
 >
 > ```python