code: def forward(self, x):
      collect_fm = self.collect_attention(x)
      distribute_fm = self.distribute_attention(x)
      psa_fm = torch.cat([collect_fm, distribute_fm], dim=1)
      return psa_fm
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  from pywick.models.segmentation.da_basenets.basic import _ConvBNReLU
  from pywick.models.segmentation.da_basenets.segbase import SegBaseModel
  from pywick.models.segmentation.da_basenets.fcn import _FCNHead
label_desc: Use image node_id 2 for calling the _PointwiseSpatialAttention obj's underlying member method code with example usage: obj.forward(x) and returns: psa_fm