class_docstr: Base class for optimizers.
  
  Args:
      name (string): (<span style="color:#0000C0"><b>internal use</b></span>).
      arguments_spec (specification): <span style="color:#0000C0"><b>internal use</b></span>.
code: def initialize_given_variables(self, *, variables):
      assert (
          not self.root.is_initialized
          and not self.is_initialized_given_variables
      )
  
      for module in self.this_submodules:
          if isinstance(module, Optimizer):
              module.initialize_given_variables(variables=variables)
  
      # Replace "/" with "_" to ensure TensorDict is flat
      self.variables_spec = TensorsSpec(
          (
              (
                  var.name[:-2].replace("/", "_"),
                  TensorSpec(
                      type=tf_util.dtype(x=var, fallback_tf_dtype=True),
                      shape=tf_util.shape(x=var),
                  ),
              )
              for var in variables
          )
      )
  
      self.is_initialized_given_variables = True
  
      if self.config.create_debug_assertions:
          self.is_initialized = False
          for variable in variables:
              self.zero_check_history = self.variable(
                  name="zero_check_history",
                  spec=TensorSpec(
                      type="bool", shape=(3, len(variables))
                  ),
                  initializer="zeros",
                  is_trainable=False,
                  is_saved=False,
              )
              self.zero_check_index = self.variable(
                  name="zero_check_index",
                  spec=TensorSpec(type="int", shape=()),
                  initializer="zeros",
                  is_trainable=False,
                  is_saved=False,
              )
          self.is_initialized = True
  
file_path: tensorforce/tensorforce/core/optimizers/optimizer.py
imports: import tensorflow
  from tensorforce.core import Module, SignatureDict, TensorSpec, TensorsSpec, tf_function, tf_util
label_desc: Use image node_id 2 for calling the Optimizer obj's underlying member method code with example usage: obj.initialize_given_variables() without return types