class_docstr: Represents a symbolic input for use with function or FunctionMaker.
  
  Parameters
  ----------
  variable : a Variable instance
      This will be assigned a value before running the function, not computed
      from its owner.
  name : Any type
      If autoname=True, defaults to variable.name.
      If name is a valid Python identifier, this input can be set by kwarg,
      and its value can be accessed by self.<name>.
  update : Variable instance
      Defaults to None. Value (see previous) will be replaced with this
      expression variable after each function call. If update is None, the
      update will be the default value of the input.
  mutable : bool
      Defaults to False if update is None, True if update is not None.
      True: permit the compiled function to modify the python object being
      passed as the input.
      False: do not permit the compiled function to modify the python object
      being passed as the input.
  strict : bool
      Defaults to False.
      True: means that the value you pass for this input must have exactly the
      right type.
      False: the value you pass for this input may be cast automatically to
      the proper type.
  allow_downcast : bool or None
      Defaults to None. Only applies when `strict` is False.
      True: the value you pass for this input can be silently downcasted to
      fit the right type, which may lose precision.
      False: the value will only be cast to a more general, or precise, type.
      None: Almost like False, but allows downcast of Python floats to floatX.
  autoname : bool
      Defaults to True. See the name option.
  implicit : bool
      Defaults to False. See help(In). Note that 'None' is not allowed here,
      since we are in the symbolic case.
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code: def __repr__(self):
      return str(self)
  
file_path: pytensor/pytensor/compile/io.py
imports: import logging
  from pytensor.link.basic import Container
label_desc: Use image node_id 3 for calling the SymbolicInput obj's underlying member method code with example usage: obj.__repr__() and returns: str