Implement __new__ on Normalizers

__new__ allows Normalizers to be initialized as normal python
objects. This also means that Normalizers are given the correct class
name.

bindings/python/src/normalizers.rs

@@ -10,13 +10,13 @@ pub struct Normalizer {
     pub normalizer: Container<dyn tk::tokenizer::Normalizer + Sync>,
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct BertNormalizer {}
 #[pymethods]
 impl BertNormalizer {
-    #[staticmethod]
+    #[new]
     #[args(kwargs = "**")]
-    fn new(kwargs: Option<&PyDict>) -> PyResult<Normalizer> {
+    fn new(obj: &PyRawObject, kwargs: Option<&PyDict>) -> PyResult<()> {
         let mut clean_text = true;
         let mut handle_chinese_chars = true;
         let mut strip_accents = true;
@@ -35,71 +35,71 @@ impl BertNormalizer {
             }
         }
 
-        Ok(Normalizer {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::bert::BertNormalizer::new(
                 clean_text,
                 handle_chinese_chars,
                 strip_accents,
                 lowercase,
             ))),
-        })
+        }))
     }
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct NFD {}
 #[pymethods]
 impl NFD {
-    #[staticmethod]
-    fn new() -> PyResult<Normalizer> {
-        Ok(Normalizer {
+    #[new]
+    fn new(obj: &PyRawObject) -> PyResult<()> {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::unicode::NFD)),
-        })
+        }))
     }
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct NFKD {}
 #[pymethods]
 impl NFKD {
-    #[staticmethod]
-    fn new() -> PyResult<Normalizer> {
-        Ok(Normalizer {
+    #[new]
+    fn new(obj: &PyRawObject) -> PyResult<()> {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::unicode::NFKD)),
-        })
+        }))
     }
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct NFC {}
 #[pymethods]
 impl NFC {
-    #[staticmethod]
-    fn new() -> PyResult<Normalizer> {
-        Ok(Normalizer {
+    #[new]
+    fn new(obj: &PyRawObject) -> PyResult<()> {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::unicode::NFC)),
-        })
+        }))
     }
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct NFKC {}
 #[pymethods]
 impl NFKC {
-    #[staticmethod]
-    fn new() -> PyResult<Normalizer> {
-        Ok(Normalizer {
+    #[new]
+    fn new(obj: &PyRawObject) -> PyResult<()> {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::unicode::NFKC)),
-        })
+        }))
     }
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct Sequence {}
 #[pymethods]
 impl Sequence {
-    #[staticmethod]
-    fn new(normalizers: &PyList) -> PyResult<Normalizer> {
+    #[new]
+    fn new(obj: &PyRawObject, normalizers: &PyList) -> PyResult<()> {
         let normalizers = normalizers
             .iter()
             .map(|n| {
@@ -114,22 +114,22 @@ impl Sequence {
             })
             .collect::<PyResult<_>>()?;
 
-        Ok(Normalizer {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::utils::Sequence::new(
                 normalizers,
             ))),
-        })
+        }))
     }
 }
 
-#[pyclass]
+#[pyclass(extends=Normalizer)]
 pub struct Lowercase {}
 #[pymethods]
 impl Lowercase {
-    #[staticmethod]
-    fn new() -> PyResult<Normalizer> {
-        Ok(Normalizer {
+    #[new]
+    fn new(obj: &PyRawObject) -> PyResult<()> {
+        Ok(obj.init(Normalizer {
             normalizer: Container::Owned(Box::new(tk::normalizers::utils::Lowercase)),
-        })
+        }))
     }
 }

bindings/python/tokenizers/implementations/bert_wordpiece.py

@@ -28,10 +28,12 @@ class BertWordPieceTokenizer(BaseTokenizer):
             tokenizer = Tokenizer(WordPiece.empty())
 
         tokenizer.add_special_tokens([unk_token, sep_token, cls_token])
-        tokenizer.normalizer = BertNormalizer.new(clean_text=clean_text,
+        tokenizer.normalizer = BertNormalizer(
+            clean_text=clean_text,
             handle_chinese_chars=handle_chinese_chars,
             strip_accents=strip_accents,
-                                                  lowercase=lowercase)
+            lowercase=lowercase,
+        )
         tokenizer.pre_tokenizer = BertPreTokenizer.new()
 
         if add_special_tokens and vocab_file is not None:

bindings/python/tokenizers/implementations/byte_level_bpe.py

@@ -36,12 +36,12 @@ class ByteLevelBPETokenizer(BaseTokenizer):
             normalizers += [unicode_normalizer_from_str(unicode_normalizer)]
 
         if do_lowercase:
-            normalizers += [Lowercase.new()]
+            normalizers += [Lowercase()]
 
         # Create the normalizer structure
         if len(normalizers) > 0:
             if len(normalizers) > 1:
-                tokenizer.normalizer = Sequence.new(normalizers)
+                tokenizer.normalizer = Sequence(normalizers)
             else:
                 tokenizer.normalizer = normalizers[0]
 

bindings/python/tokenizers/implementations/char_level_bpe.py

@@ -42,12 +42,12 @@ class CharBPETokenizer(BaseTokenizer):
             normalizers += [unicode_normalizer_from_str(unicode_normalizer)]
 
         if do_lowercase:
-            normalizers += [Lowercase.new()]
+            normalizers += [Lowercase()]
 
         # Create the normalizer structure
         if len(normalizers) > 0:
             if len(normalizers) > 1:
-                tokenizer.normalizer = Sequence.new(normalizers)
+                tokenizer.normalizer = Sequence(normalizers)
             else:
                 tokenizer.normalizer = normalizers[0]
 

bindings/python/tokenizers/implementations/sentencepiece_bpe.py

@@ -28,7 +28,7 @@ class SentencePieceBPETokenizer(BaseTokenizer):
 
         tokenizer.add_special_tokens([ unk_token ])
 
-        tokenizer.normalizer = NFKC.new()
+        tokenizer.normalizer = NFKC()
         tokenizer.pre_tokenizer = pre_tokenizers.Metaspace.new(replacement=replacement,
                                                                add_prefix_space=add_prefix_space)
         tokenizer.decoder = decoders.Metaspace.new(replacement=replacement,

bindings/python/tokenizers/normalizers/__init__.pyi

@@ -14,11 +14,13 @@ class BertNormalizer(Normalizer):
     This includes cleaning the text, handling accents, chinese chars and lowercasing
     """
 
-    @staticmethod
-    def new(clean_text: Optional[bool]=True,
+    def __init__(
+        self,
+        clean_text: Optional[bool] = True,
         handle_chinese_chars: Optional[bool] = True,
         strip_accents: Optional[bool] = True,
-            lowercase: Optional[bool]=True) -> Normalizer:
+        lowercase: Optional[bool] = True,
+    ) -> None:
         """ Instantiate a BertNormalizer with the given options.
 
         Args:
@@ -43,32 +45,28 @@ class BertNormalizer(Normalizer):
 class NFD(Normalizer):
     """ NFD Unicode Normalizer """
 
-    @staticmethod
-    def new() -> Normalizer:
+    def __init__(self) -> None:
         """ Instantiate a new NFD Normalizer """
         pass
 
 class NFKD(Normalizer):
     """ NFKD Unicode Normalizer """
 
-    @staticmethod
-    def new() -> Normalizer:
+    def __init__(self) -> None:
         """ Instantiate a new NFKD Normalizer """
         pass
 
 class NFC(Normalizer):
     """ NFC Unicode Normalizer """
 
-    @staticmethod
-    def new() -> Normalizer:
+    def __init__(self) -> None:
         """ Instantiate a new NFC Normalizer """
         pass
 
 class NFKC(Normalizer):
     """ NFKC Unicode Normalizer """
 
-    @staticmethod
-    def new() -> Normalizer:
+    def __init__(self) -> None:
         """ Instantiate a new NFKC Normalizer """
         pass
 
@@ -78,8 +76,7 @@ class Sequence(Normalizer):
     All the normalizers run in sequence in the given order
     """
 
-    @staticmethod
-    def new(normalizers: List[Normalizer]) -> Normalizer:
+    def __init__(self, normalizers: List[Normalizer]) -> None:
         """ Instantiate a new normalization Sequence using the given normalizers
 
         Args:
@@ -91,12 +88,10 @@ class Sequence(Normalizer):
 class Lowercase(Normalizer):
     """ Lowercase Normalizer """
 
-    @staticmethod
-    def new() -> Normalizer:
+    def __init__(self) -> None:
         """ Instantiate a new Lowercase Normalizer """
         pass
 
-
 def unicode_normalizer_from_str(normalizer: str) -> Normalizer:
     """
     Instanciate unicode normalizer from the normalizer name