Why does sample_posterior_predictive use only one chain?

Questions
17

Meanwhile I am suppressing the thousands of warnings via:

import logging
class DisableLogger():
    def __enter__(self):
        logger = logging.getLogger('arviz.stats.stats_utils')
        logger.disabled = True
    def __exit__(self, exit_type, exit_value, exit_traceback):
        logger = logging.getLogger('arviz.stats.stats_utils')
        logger.disabled = False

with DisableLogger():
    function_that_produces_warnings()