code: def get_self_correlation_mask(self, img_feat):
      _, _, h, w = img_feat.shape
      self_mask = F.one_hot(
          paddle.reshape(paddle.arange(h * w), (h, w)),
          num_classes=int(h * w),
      )
  
      self_mask = paddle.transpose(self_mask, (2, 0, 1))
      self_mask = paddle.reshape(self_mask, (1, h * w, h, w))
  
      return self_mask * (-1e4)
  
file_path: PaddleSeg/Matting/ppmatting/models/layers/gca_module.py
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import param_init
label_desc: Use image node_id 10 for calling the GuidedCxtAtten obj's underlying member method code with example usage: obj.get_self_correlation_mask(img_feat) and returns: unknown