fix KB IO (#6118)

spacy/kb.pxd

@@ -140,7 +140,6 @@ cdef class KnowledgeBase:
         self._entries.push_back(entry)
         self._aliases_table.push_back(alias)
 
-    cpdef from_disk(self, loc)
     cpdef set_entities(self, entity_list, freq_list, vector_list)
 
 

spacy/kb.pyx

@@ -9,7 +9,8 @@ from libcpp.vector cimport vector
 
 from pathlib import Path
 import warnings
-from os import path
+
+from spacy import util
 
 from .typedefs cimport hash_t
 from .errors import Errors, Warnings
@@ -319,8 +320,14 @@ cdef class KnowledgeBase:
         return 0.0
 
 
-    def to_disk(self, loc):
-        cdef Writer writer = Writer(loc)
+    def to_disk(self, path):
+        path = util.ensure_path(path)
+        if path.is_dir():
+            raise ValueError(Errors.E928.format(loc=path))
+        if not path.parent.exists():
+            path.parent.mkdir(parents=True)
+
+        cdef Writer writer = Writer(path)
         writer.write_header(self.get_size_entities(), self.entity_vector_length)
 
         # dumping the entity vectors in their original order
@@ -359,7 +366,13 @@ cdef class KnowledgeBase:
 
         writer.close()
 
-    cpdef from_disk(self, loc):
+    def from_disk(self, path):
+        path = util.ensure_path(path)
+        if path.is_dir():
+            raise ValueError(Errors.E928.format(loc=path))
+        if not path.exists():
+            raise ValueError(Errors.E929.format(loc=path))
+
         cdef hash_t entity_hash
         cdef hash_t alias_hash
         cdef int64_t entry_index
@@ -369,7 +382,7 @@ cdef class KnowledgeBase:
         cdef AliasC alias
         cdef float vector_element
 
-        cdef Reader reader = Reader(loc)
+        cdef Reader reader = Reader(path)
 
         # STEP 0: load header and initialize KB
         cdef int64_t nr_entities
@@ -450,16 +463,13 @@ cdef class KnowledgeBase:
 
 
 cdef class Writer:
-    def __init__(self, object loc):
-        if isinstance(loc, Path):
-            loc = bytes(loc)
-        if path.exists(loc):
-            if path.isdir(loc):
-                raise ValueError(Errors.E928.format(loc=loc))
-        cdef bytes bytes_loc = loc.encode('utf8') if type(loc) == unicode else loc
+    def __init__(self, path):
+        assert isinstance(path, Path)
+        content = bytes(path)
+        cdef bytes bytes_loc = content.encode('utf8') if type(content) == unicode else content
         self._fp = fopen(<char*>bytes_loc, 'wb')
         if not self._fp:
-            raise IOError(Errors.E146.format(path=loc))
+            raise IOError(Errors.E146.format(path=path))
         fseek(self._fp, 0, 0)
 
     def close(self):
@@ -496,14 +506,9 @@ cdef class Writer:
 
 
 cdef class Reader:
-    def __init__(self, object loc):
-        if isinstance(loc, Path):
-            loc = bytes(loc)
-        if not path.exists(loc):
-            raise ValueError(Errors.E929.format(loc=loc))
-        if path.isdir(loc):
-            raise ValueError(Errors.E928.format(loc=loc))
-        cdef bytes bytes_loc = loc.encode('utf8') if type(loc) == unicode else loc
+    def __init__(self, path):
+        content = bytes(path)
+        cdef bytes bytes_loc = content.encode('utf8') if type(content) == unicode else content
         self._fp = fopen(<char*>bytes_loc, 'rb')
         if not self._fp:
             PyErr_SetFromErrno(IOError)

spacy/tests/pipeline/test_entity_linker.py

@@ -144,6 +144,29 @@ def test_kb_empty(nlp):
         entity_linker.begin_training(lambda: [])
 
 
+def test_kb_serialize(nlp):
+    """Test serialization of the KB"""
+    mykb = KnowledgeBase(nlp.vocab, entity_vector_length=1)
+    with make_tempdir() as d:
+        # normal read-write behaviour
+        mykb.to_disk(d / "kb")
+        mykb.from_disk(d / "kb")
+        mykb.to_disk(d / "kb.file")
+        mykb.from_disk(d / "kb.file")
+        mykb.to_disk(d / "new" / "kb")
+        mykb.from_disk(d / "new" / "kb")
+        # allow overwriting an existing file
+        mykb.to_disk(d / "kb.file")
+        with pytest.raises(ValueError):
+            # can not write to a directory
+            mykb.to_disk(d)
+        with pytest.raises(ValueError):
+            # can not read from a directory
+            mykb.from_disk(d)
+        with pytest.raises(ValueError):
+            # can not read from an unknown file
+            mykb.from_disk(d / "unknown" / "kb")
+
 def test_candidate_generation(nlp):
     """Test correct candidate generation"""
     mykb = KnowledgeBase(nlp.vocab, entity_vector_length=1)