diff --git a/spacy/ml/models/parser.py b/spacy/ml/models/parser.py
index da53f562e..fd476382f 100644
--- a/spacy/ml/models/parser.py
+++ b/spacy/ml/models/parser.py
@@ -1,13 +1,15 @@
-from typing import Optional, List
-from thinc.api import Model, chain, list2array, Linear, zero_init, use_ops
+from typing import Optional, List, Tuple, Any
 from thinc.types import Floats2d
+from thinc.api import Model
 
 from ...errors import Errors
 from ...compat import Literal
 from ...util import registry
-from .._precomputable_affine import PrecomputableAffine
 from ..tb_framework import TransitionModel
-from ...tokens import Doc
+from ...tokens.doc import Doc
+
+TransitionSystem = Any  # TODO
+State = Any  # TODO
 
 
 @registry.architectures.register("spacy.TransitionBasedParser.v1")
@@ -19,7 +21,7 @@ def transition_parser_v1(
     maxout_pieces: int,
     use_upper: bool = True,
     nO: Optional[int] = None,
-) -> Model:
+) -> Model[Tuple[List[Doc], TransitionSystem], List[Tuple[State, List[Floats2d]]]]:
     return build_tb_parser_model(
         tok2vec,
         state_type,
@@ -47,8 +49,26 @@ def transition_parser_v2(
         extra_state_tokens,
         hidden_width,
         maxout_pieces,
-        use_upper,
-        nO,
+        nO=nO,
+    )
+
+
+@registry.architectures.register("spacy.TransitionBasedParser.v3")
+def transition_parser_v2(
+    tok2vec: Model[List[Doc], List[Floats2d]],
+    state_type: Literal["parser", "ner"],
+    extra_state_tokens: bool,
+    hidden_width: int,
+    maxout_pieces: int,
+    nO: Optional[int] = None,
+) -> Model:
+    return build_tb_parser_model(
+        tok2vec,
+        state_type,
+        extra_state_tokens,
+        hidden_width,
+        maxout_pieces,
+        nO=nO,
     )
 
 
@@ -58,7 +78,6 @@ def build_tb_parser_model(
     extra_state_tokens: bool,
     hidden_width: int,
     maxout_pieces: int,
-    use_upper: bool,
     nO: Optional[int] = None,
 ) -> Model:
     """
@@ -110,102 +129,11 @@ def build_tb_parser_model(
         nr_feature_tokens = 6 if extra_state_tokens else 3
     else:
         raise ValueError(Errors.E917.format(value=state_type))
-    t2v_width = tok2vec.get_dim("nO") if tok2vec.has_dim("nO") else None
-    tok2vec = chain(tok2vec, list2array(), Linear(hidden_width, t2v_width))
-    tok2vec.set_dim("nO", hidden_width)
-    lower = _define_lower(
-        nO=hidden_width if use_upper else nO,
-        nF=nr_feature_tokens,
-        nI=tok2vec.get_dim("nO"),
-        nP=maxout_pieces,
+    return TransitionModel(
+        tok2vec=tok2vec,
+        state_tokens=nr_feature_tokens,
+        hidden_width=hidden_width,
+        maxout_pieces=maxout_pieces,
+        nO=nO,
+        unseen_classes=set(),
     )
-    upper = None
-    if use_upper:
-        with use_ops("numpy"):
-            # Initialize weights at zero, as it's a classification layer.
-            upper = _define_upper(nO=nO, nI=None)
-    return TransitionModel(tok2vec, lower, upper, resize_output)
-
-
-def _define_upper(nO, nI):
-    return Linear(nO=nO, nI=nI, init_W=zero_init)
-
-
-def _define_lower(nO, nF, nI, nP):
-    return PrecomputableAffine(nO=nO, nF=nF, nI=nI, nP=nP)
-
-
-def resize_output(model, new_nO):
-    if model.attrs["has_upper"]:
-        return _resize_upper(model, new_nO)
-    return _resize_lower(model, new_nO)
-
-
-def _resize_upper(model, new_nO):
-    upper = model.get_ref("upper")
-    if upper.has_dim("nO") is None:
-        upper.set_dim("nO", new_nO)
-        return model
-    elif new_nO == upper.get_dim("nO"):
-        return model
-
-    smaller = upper
-    nI = smaller.maybe_get_dim("nI")
-    with use_ops("numpy"):
-        larger = _define_upper(nO=new_nO, nI=nI)
-    # it could be that the model is not initialized yet, then skip this bit
-    if smaller.has_param("W"):
-        larger_W = larger.ops.alloc2f(new_nO, nI)
-        larger_b = larger.ops.alloc1f(new_nO)
-        smaller_W = smaller.get_param("W")
-        smaller_b = smaller.get_param("b")
-        # Weights are stored in (nr_out, nr_in) format, so we're basically
-        # just adding rows here.
-        if smaller.has_dim("nO"):
-            old_nO = smaller.get_dim("nO")
-            larger_W[:old_nO] = smaller_W
-            larger_b[:old_nO] = smaller_b
-            for i in range(old_nO, new_nO):
-                model.attrs["unseen_classes"].add(i)
-
-        larger.set_param("W", larger_W)
-        larger.set_param("b", larger_b)
-    model._layers[-1] = larger
-    model.set_ref("upper", larger)
-    return model
-
-
-def _resize_lower(model, new_nO):
-    lower = model.get_ref("lower")
-    if lower.has_dim("nO") is None:
-        lower.set_dim("nO", new_nO)
-        return model
-
-    smaller = lower
-    nI = smaller.maybe_get_dim("nI")
-    nF = smaller.maybe_get_dim("nF")
-    nP = smaller.maybe_get_dim("nP")
-    larger = _define_lower(nO=new_nO, nI=nI, nF=nF, nP=nP)
-    # it could be that the model is not initialized yet, then skip this bit
-    if smaller.has_param("W"):
-        larger_W = larger.ops.alloc4f(nF, new_nO, nP, nI)
-        larger_b = larger.ops.alloc2f(new_nO, nP)
-        larger_pad = larger.ops.alloc4f(1, nF, new_nO, nP)
-        smaller_W = smaller.get_param("W")
-        smaller_b = smaller.get_param("b")
-        smaller_pad = smaller.get_param("pad")
-        # Copy the old weights and padding into the new layer
-        if smaller.has_dim("nO"):
-            old_nO = smaller.get_dim("nO")
-            larger_W[:, 0:old_nO, :, :] = smaller_W
-            larger_pad[:, :, 0:old_nO, :] = smaller_pad
-            larger_b[0:old_nO, :] = smaller_b
-            for i in range(old_nO, new_nO):
-                model.attrs["unseen_classes"].add(i)
-
-        larger.set_param("W", larger_W)
-        larger.set_param("b", larger_b)
-        larger.set_param("pad", larger_pad)
-    model._layers[1] = larger
-    model.set_ref("lower", larger)
-    return model