| 1181 | |
| 1182 | |
| 1183 | class Moment(ArrayReduction): |
| 1184 | _parameters = ["frame", "order"] |
| 1185 | |
| 1186 | @functools.cached_property |
| 1187 | def _meta(self): |
| 1188 | # Use var as proxy for result dimension |
| 1189 | return make_meta(meta_nonempty(self.frame._meta).var()) |
| 1190 | |
| 1191 | @property |
| 1192 | def chunk_kwargs(self): |
| 1193 | return dict(order=self.order) |
| 1194 | |
| 1195 | @property |
| 1196 | def combine_kwargs(self): |
| 1197 | return self.chunk_kwargs |
| 1198 | |
| 1199 | @property |
| 1200 | def aggregate_kwargs(self): |
| 1201 | return dict( |
| 1202 | order=self.order, |
| 1203 | meta=self._meta, |
| 1204 | index=self.frame.columns, |
| 1205 | ) |
| 1206 | |
| 1207 | @classmethod |
| 1208 | def reduction_chunk(cls, x, order): |
| 1209 | values = x.values.astype("f8") |
| 1210 | return moment_chunk(values, order=order, axis=(0,), keepdims=True) |
| 1211 | |
| 1212 | @classmethod |
| 1213 | def reduction_combine(cls, parts, order): |
| 1214 | return moment_combine(parts, order=order, axis=(0,)) |
| 1215 | |
| 1216 | @classmethod |
| 1217 | def reduction_aggregate(cls, vals, order): |
| 1218 | result = moment_agg(vals, order=order, axis=(0,)) |
| 1219 | return result |
| 1220 | |
| 1221 | |
| 1222 | class Mean(Reduction): |