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Evaluate a model loaded from a checkpoint. (deprecated)

Given graph, a directory to write summaries to (output_dir), a checkpoint to restore variables from, and a dict of Tensors to evaluate, run an eval loop for max_steps steps, or until an exception (generally, an end-of-input signal from a reader operation) is raised from running eval_dict.

In each step of evaluation, all tensors in the eval_dict are evaluated, and every log_every_steps steps, they are logged. At the very end of evaluation, a summary is evaluated (finding the summary ops using Supervisor's logic) and written to output_dir.

graph A Graph to train. It is expected that this graph is not in use elsewhere.
output_dir A string containing the directory to write a summary to.
checkpoint_path A string containing the path to a checkpoint to restore. Can be None if the graph doesn't require loading any variables.
eval_dict A dict mapping string names to tensors to evaluate. It is evaluated in every logging step. The result of the final evaluation is returned. If update_op is None, then it's evaluated in every step. If max_steps is None, this should depend on a reader that will raise an end-of-input exception when the inputs are exhausted.
update_op A Tensor which is run in every step.
global_step_tensor A Variable containing the global step. If None, one is extracted from the graph using the same logic as in Supervisor. Used to place eval summaries on training curves.
supervisor_master The master string to use when preparing the session.
log_every_steps Integer. Output logs every log_every_steps evaluation steps. The logs contain the eval_dict and timing information.
feed_fn A function that is called every iteration to produce a feed_dict passed to calls. Optional.
max_steps Integer. Evaluate eval_dict this many times.

A tuple (eval_results, global_step):
eval_results A dict mapping string to numeric values (int, float) that are the result of running eval_dict in the last step. None if no eval steps were run.
global_step The global step this evaluation corresponds to.

ValueError if output_dir is empty.