Fix pickle for ngram suggester (#12486)

spacy/pipeline/spancat.py

@@ -1,5 +1,6 @@
 from typing import List, Dict, Callable, Tuple, Optional, Iterable, Any, cast, Union
 from dataclasses import dataclass
+from functools import partial
 from thinc.api import Config, Model, get_current_ops, set_dropout_rate, Ops
 from thinc.api import Optimizer
 from thinc.types import Ragged, Ints2d, Floats2d
@@ -82,39 +83,42 @@ class Suggester(Protocol):
         ...
 
 
+def ngram_suggester(
+    docs: Iterable[Doc], sizes: List[int], *, ops: Optional[Ops] = None
+) -> Ragged:
+    if ops is None:
+        ops = get_current_ops()
+    spans = []
+    lengths = []
+    for doc in docs:
+        starts = ops.xp.arange(len(doc), dtype="i")
+        starts = starts.reshape((-1, 1))
+        length = 0
+        for size in sizes:
+            if size <= len(doc):
+                starts_size = starts[: len(doc) - (size - 1)]
+                spans.append(ops.xp.hstack((starts_size, starts_size + size)))
+                length += spans[-1].shape[0]
+            if spans:
+                assert spans[-1].ndim == 2, spans[-1].shape
+        lengths.append(length)
+    lengths_array = ops.asarray1i(lengths)
+    if len(spans) > 0:
+        output = Ragged(ops.xp.vstack(spans), lengths_array)
+    else:
+        output = Ragged(ops.xp.zeros((0, 0), dtype="i"), lengths_array)
+
+    assert output.dataXd.ndim == 2
+    return output
+
+
 @registry.misc("spacy.ngram_suggester.v1")
 def build_ngram_suggester(sizes: List[int]) -> Suggester:
     """Suggest all spans of the given lengths. Spans are returned as a ragged
     array of integers. The array has two columns, indicating the start and end
     position."""
 
-    def ngram_suggester(docs: Iterable[Doc], *, ops: Optional[Ops] = None) -> Ragged:
-        if ops is None:
-            ops = get_current_ops()
-        spans = []
-        lengths = []
-        for doc in docs:
-            starts = ops.xp.arange(len(doc), dtype="i")
-            starts = starts.reshape((-1, 1))
-            length = 0
-            for size in sizes:
-                if size <= len(doc):
-                    starts_size = starts[: len(doc) - (size - 1)]
-                    spans.append(ops.xp.hstack((starts_size, starts_size + size)))
-                    length += spans[-1].shape[0]
-                if spans:
-                    assert spans[-1].ndim == 2, spans[-1].shape
-            lengths.append(length)
-        lengths_array = ops.asarray1i(lengths)
-        if len(spans) > 0:
-            output = Ragged(ops.xp.vstack(spans), lengths_array)
-        else:
-            output = Ragged(ops.xp.zeros((0, 0), dtype="i"), lengths_array)
-
-        assert output.dataXd.ndim == 2
-        return output
-
-    return ngram_suggester
+    return partial(ngram_suggester, sizes=sizes)
 
 
 @registry.misc("spacy.ngram_range_suggester.v1")

spacy/tests/pipeline/test_spancat.py

@@ -1,7 +1,7 @@
 import pytest
 import numpy
 from numpy.testing import assert_array_equal, assert_almost_equal
-from thinc.api import get_current_ops, Ragged
+from thinc.api import get_current_ops, NumpyOps, Ragged
 
 from spacy import util
 from spacy.lang.en import English
@@ -577,3 +577,21 @@ def test_set_candidates(name):
     assert len(docs[0].spans["candidates"]) == 9
     assert docs[0].spans["candidates"][0].text == "Just"
     assert docs[0].spans["candidates"][4].text == "Just a"
+
+
+@pytest.mark.parametrize("name", SPANCAT_COMPONENTS)
+@pytest.mark.parametrize("n_process", [1, 2])
+def test_spancat_multiprocessing(name, n_process):
+    if isinstance(get_current_ops, NumpyOps) or n_process < 2:
+        nlp = Language()
+        spancat = nlp.add_pipe(name, config={"spans_key": SPAN_KEY})
+        train_examples = make_examples(nlp)
+        nlp.initialize(get_examples=lambda: train_examples)
+        texts = [
+            "Just a sentence.",
+            "I like London and Berlin",
+            "I like Berlin",
+            "I eat ham.",
+        ]
+        docs = list(nlp.pipe(texts, n_process=n_process))
+        assert len(docs) == len(texts)