🐛[BUG]: GraphcastOperational Can't Handle multiple timestamps.

[dallasfoster]

Version

0.8.0

On which installation method(s) does this occur?

source

Describe the issue

Graphcast has the following input coords

input_coords = OrderedDict(
            {
                "batch": np.empty(0),
                "time": np.empty(0),
                "lead_time": np.array(
                    [
                        np.timedelta64(-6, "h"),
                        np.timedelta64(0, "h"),
                    ]
                ),
                "variable": np.array(VARIABLES),
                "lat": np.linspace(-90, 90, 721, endpoint=True),
                "lon": np.linspace(0, 360, 1440, endpoint=False),
            }
        )

Which would indicate that the time dimension is free but in reality the model errors (under the hood in evaluation) if more than a single timestamp is passed. I would suggest adding a simple loop over the timestamps passed in to alleviate this issue.