docstr: Updates the value of a specified variable. Type of assign_op is dependant on the framework
  and is a unique identifier for assigning value to a variable. For example an agent may use
  head.assign_kl_coefficient. There is a one to one mapping between assign_op and placeholder
  (in the example above, placeholder would be head.kl_coefficient_ph).
  
  :param assign_op: a parameter representing the operation for assigning value to a specific variable
  :param value: value of the specified variable used for update
  :param placeholder: a placeholder for binding the value to assign_op.
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code: def set_variable_value(
      self, assign_op: Any, value: np.ndarray, placeholder: Any
  ):
      """
      Updates the value of a specified variable. Type of assign_op is dependant on the framework
      and is a unique identifier for assigning value to a variable. For example an agent may use
      head.assign_kl_coefficient. There is a one to one mapping between assign_op and placeholder
      (in the example above, placeholder would be head.kl_coefficient_ph).
  
      :param assign_op: a parameter representing the operation for assigning value to a specific variable
      :param value: value of the specified variable used for update
      :param placeholder: a placeholder for binding the value to assign_op.
      """
      raise NotImplementedError
  
imports: from typing import Any, Dict, List, Tuple
  import numpy
  from rl_coach.base_parameters import AgentParameters
  from rl_coach.saver import SaverCollection
  from rl_coach.spaces import SpacesDefinition
label_desc: Use image node_id 13 for calling the Architecture obj's underlying member method code with example usage: obj.set_variable_value(assign_op, value, placeholder) without return types