code: def __init__(self):
      super().__init__(
          SymbolicExpression, include_header=expr_include_list
      )
      self.template = expr_function_template
  
imports: import re
  from sympy.core import S
  from sympy.core.numbers import Integer
  from sympy.printing.cxx import CXX11CodePrinter
  from hls4ml.backends.template import FunctionCallTemplate, LayerConfigTemplate
  from hls4ml.model.layers import SymbolicExpression
label_desc: Use image node_id 1 to create a new ExpressionFunctionTemplate object from inherited base classes: FunctionCallTemplate with example: obj = ExpressionFunctionTemplate()