See the guide: Framework (contrib) > Variables
Creates an assignment operation from a given mapping.
This function provides a mechanism for performing assignment of variables to values in a way that does not fill the graph with large assignment values.
var_names_to_values: A map from variable names to values.
Operationthat assigns each of the given variables to the requested values.
feed_dict: The feed dictionary to use when evaluating
ValueError: if any of the given variable names were not found.