Makes data_utils.get_num_dialog_examples() return the correct number.
Makes data_utils.get_num_dialog_examples() return the correct number.

PiperOrigin-RevId: 275075153

google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research