class_docstr: The Injector module in ViT-Adapter.
code: def forward(
      self,
      query,
      reference_points,
      feat,
      spatial_shapes,
      level_start_index,
  ):
      attn = self.attn(
          self.query_norm(query),
          reference_points,
          self.feat_norm(feat),
          spatial_shapes,
          level_start_index,
          None,
      )
      return query + self.gamma * attn
  
imports: import math
  import warnings
  from functools import partial
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.models.backbones.transformer_utils import DropPath
  from paddleseg.models.layers.ms_deformable_attention import MSDeformAttn
label_desc: Use image node_id 2 for calling the Injector obj's underlying member method code with example usage: obj.forward(query, reference_points, feat, spatial_shapes, level_start_index) and returns: unknown