code: def _define_upper(nO, nI):
      return Linear(nO=nO, nI=nI, init_W=zero_init)
  
file_path: spacy/spacy/ml/models/parser.py
imports: from typing import List, Optional, cast
  from thinc.api import Linear, Model, chain, list2array, use_ops, zero_init
  from thinc.types import Floats2d
  from ...compat import Literal
  from ...errors import Errors
  from ...tokens import Doc
  from ...util import registry
  from .._precomputable_affine import PrecomputableAffine
  from ..tb_framework import TransitionModel
label_desc: Use image node_id 2 for calling a global function with example usage: _define_upper(nO, nI) and returns: Linear