code: def forward(self, x, mask=None):
      if mask is None:
          mask = paddle.zeros(
              (x.shape[0], x.shape[2], x.shape[3]), dtype="bool"
          )
      not_mask = ~mask
      y_embed = not_mask.astype("float32").cumsum(1)
      x_embed = not_mask.astype("float32").cumsum(2)
      if self.normalize:
          eps = 1e-6
          y_embed = y_embed / (y_embed[:, -1:, :] + eps) * self.scale
          x_embed = x_embed / (x_embed[:, :, -1:] + eps) * self.scale
  
      dim_t = paddle.arange(self.num_pos_feats, dtype="int64")
      dim_t = self.temperature ** (
          2 * (dim_t // 2).astype("float32") / self.num_pos_feats
      )
  
      pos_x = x_embed[:, :, :, None] / dim_t
      pos_y = y_embed[:, :, :, None] / dim_t
      pos_x = paddle.stack(
          (pos_x[:, :, :, 0::2].sin(), pos_x[:, :, :, 1::2].cos()),
          axis=4,
      ).flatten(3)
      pos_y = paddle.stack(
          (pos_y[:, :, :, 0::2].sin(), pos_y[:, :, :, 1::2].cos()),
          axis=4,
      ).flatten(3)
      pos = paddle.concat((pos_y, pos_x), axis=3).transpose(
          (0, 3, 1, 2)
      )
      return pos
  
file_path: PaddleSeg/contrib/PanopticSeg/paddlepanseg/models/mask2former/common.py
imports: import math
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddlepanseg.models.common import *
label_desc: Use image node_id 2 for calling the PositionEmbeddingSine obj's underlying member method code with example usage: obj.forward(x, mask) and returns: pos