Implement StringStore serialization, and update tests

spacy/strings.pyx

@@ -7,9 +7,12 @@ from libc.string cimport memcpy
 from libc.stdint cimport uint64_t, uint32_t
 from murmurhash.mrmr cimport hash64, hash32
 from preshed.maps cimport map_iter, key_t
+from libc.stdint cimport uint32_t
+import ujson
+import dill
 
 from .typedefs cimport hash_t
-from libc.stdint cimport uint32_t
+from . import util
 
 
 cpdef hash_t hash_string(unicode string) except 0:
@@ -92,14 +95,6 @@ cdef class StringStore:
         def __get__(self):
             return self.size -1
 
-    def __reduce__(self):
-        # TODO: OOV words, for the is_frozen stuff?
-        if self.is_frozen:
-            raise NotImplementedError(
-                "Currently missing support for pickling StringStore when "
-                "is_frozen=True")
-        return (StringStore, (list(self),))
-
     def __len__(self):
         """The number of strings in the store.
 
@@ -186,7 +181,10 @@ cdef class StringStore:
         path (unicode or Path): A path to a directory, which will be created if
             it doesn't exist. Paths may be either strings or `Path`-like objects.
         """
-        raise NotImplementedError()
+        path = util.ensure_path(path)
+        strings = list(self)
+        with path.open('w') as file_:
+            ujson.dump(strings, file_)
 
     def from_disk(self, path):
         """Loads state from a directory. Modifies the object in place and
@@ -196,7 +194,11 @@ cdef class StringStore:
             strings or `Path`-like objects.
         RETURNS (StringStore): The modified `StringStore` object.
         """
-        raise NotImplementedError()
+        path = util.ensure_path(path)
+        with path.open('r') as file_:
+            strings = ujson.load(file_)
+        self._reset_and_load(strings)
+        return self
 
     def to_bytes(self, **exclude):
         """Serialize the current state to a binary string.
@@ -204,7 +206,7 @@ cdef class StringStore:
         **exclude: Named attributes to prevent from being serialized.
         RETURNS (bytes): The serialized form of the `StringStore` object.
         """
-        raise NotImplementedError()
+        return ujson.dumps(list(self))
 
     def from_bytes(self, bytes_data, **exclude):
         """Load state from a binary string.
@@ -213,7 +215,9 @@ cdef class StringStore:
         **exclude: Named attributes to prevent from being loaded.
         RETURNS (StringStore): The `StringStore` object.
         """
-        raise NotImplementedError()
+        strings = ujson.loads(bytes_data)
+        self._reset_and_load(strings)
+        return self
 
     def set_frozen(self, bint is_frozen):
         # TODO
@@ -222,6 +226,17 @@ cdef class StringStore:
     def flush_oov(self):
         self._oov = PreshMap()
 
+    def _reset_and_load(self, strings, freeze=False):
+        self.mem = Pool()
+        self._map = PreshMap()
+        self._oov = PreshMap()
+        self._resize_at = 10000
+        self.c = <Utf8Str*>self.mem.alloc(self._resize_at, sizeof(Utf8Str))
+        self.size = 1
+        for string in strings:
+            _ = self[string]
+        self.is_frozen = freeze
+
     cdef const Utf8Str* intern_unicode(self, unicode py_string):
         # 0 means missing, but we don't bother offsetting the index.
         cdef bytes byte_string = py_string.encode('utf8')

spacy/tests/stringstore/test_stringstore.py

@@ -69,10 +69,8 @@ def test_stringstore_massive_strings(stringstore):
 
 
 @pytest.mark.parametrize('text', ["qqqqq"])
-def test_stringstore_dump_load(stringstore, text_file, text):
+def test_stringstore_to_bytes(stringstore, text):
     store = stringstore[text]
-    stringstore.dump(text_file)
+    serialized = stringstore.to_bytes()
-    text_file.seek(0)
+    new_stringstore = StringStore().from_bytes(serialized)
-    new_stringstore = StringStore()
-    new_stringstore.load(text_file)
     assert new_stringstore[store] == text