code: def execute(cls, ctx, op):
      assert ctx.band[0] == op.expect_worker
      socket_type = op.socket_type or socket.SOCK_STREAM
      port_num = get_next_port(socket_type, occupy=False)
      ctx[op.outputs[0].key] = np.array([port_num], dtype=int)
  
imports: import itertools
  import socket
  import numpy
  from ...None import opcodes
  from ...core.operand import OperandStage
  from ...serialization.serializables import FieldTypes, Int32Field, ListField, StringField
  from ...tensor.merge import TensorConcatenate
  from ...utils import get_next_port
  from ..operands import LearnOperand, LearnOperandMixin, OutputType
label_desc: Use image node_id 7 for calling the CollectPorts obj's underlying member method code with example usage: obj.execute(cls, ctx, op) without return types