xarray Image plot fails with datashade=True

ALL software version info

xarray 0.17.0 hvplot 0.7.0 holoviews 1.14.1 bokeh 2.2.3 python 3.8.x notebook 6.2 OS: PopOS(Ubuntu) 20.10 Browser Brave (Chrome)

Description of expected behavior and the observed behavior

Like for xarray.hvplot.scatter in the docs, using the datashade option should work for Image rasters. Instead it throws a huge traceback.

Complete, minimal, self-contained example code that reproduces the issue

arr = xr.DataArray(
    np.arange(10000).reshape(100, 100),
    dims=("x", "y"),
    coords={"x": np.arange(100), "y": np.arange(100)},
)
arr.hvplot()
arr.hvplot(datashade=True)

Stack traceback and/or browser JavaScript console output

WARNING:param.dynamic_operation: Callable raised “AttributeError(”‘DataArray’ object has no attribute ‘_file_obj’“)”. Invoked as dynamic_operation(height=300, scale=1.0, width=700, x_range=None, y_range=None) WARNING:param.dynamic_operation: Callable raised “AttributeError(”‘DataArray’ object has no attribute ‘_file_obj’“)”. Invoked as dynamic_operation(height=300, scale=1.0, width=700, x_range=None, y_range=None)

AttributeError Traceback (most recent call last) ~/miniconda3/envs/py38/lib/python3.8/site-packages/IPython/core/formatters.py in call(self, obj, include, exclude) 968 969 if method is not None: –> 970 return method(include=include, exclude=exclude) 971 return None 972 else:

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/dimension.py in repr_mimebundle(self, include, exclude) 1314 combined and returned. 1315 “”" -> 1316 return Store.render(self) 1317 1318

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/options.py in render(cls, obj) 1403 data, metadata = {}, {} 1404 for hook in hooks: -> 1405 ret = hook(obj) 1406 if ret is None: 1407 continue

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/ipython/display_hooks.py in pprint_display(obj) 280 if not ip.display_formatter.formatters[‘text/plain’].pprint: 281 return None –> 282 return display(obj, raw_output=True) 283 284

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/ipython/display_hooks.py in display(obj, raw_output, **kwargs) 256 elif isinstance(obj, (HoloMap, DynamicMap)): 257 with option_state(obj): –> 258 output = map_display(obj) 259 elif isinstance(obj, Plot): 260 output = render(obj)

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/ipython/display_hooks.py in wrapped(element) 144 try: 145 max_frames = OutputSettings.options[‘max_frames’] –> 146 mimebundle = fn(element, max_frames=max_frames) 147 if mimebundle is None: 148 return {}, {}

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/ipython/display_hooks.py in map_display(vmap, max_frames) 204 return None 205 –> 206 return render(vmap) 207 208

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/ipython/display_hooks.py in render(obj, **kwargs) 66 renderer = renderer.instance(fig=‘png’) 67 —> 68 return renderer.components(obj, **kwargs) 69 70

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/plotting/renderer.py in components(self, obj, fmt, comm, **kwargs) 408 doc = Document() 409 with config.set(embed=embed): –> 410 model = plot.layout._render_model(doc, comm) 411 if embed: 412 return render_model(model, comm)

~/miniconda3/envs/py38/lib/python3.8/site-packages/panel/viewable.py in _render_model(self, doc, comm) 422 if comm is None: 423 comm = state._comm_manager.get_server_comm() –> 424 model = self.get_root(doc, comm) 425 426 if config.embed:

~/miniconda3/envs/py38/lib/python3.8/site-packages/panel/viewable.py in get_root(self, doc, comm, preprocess) 480 “”" 481 doc = init_doc(doc) –> 482 root = self._get_model(doc, comm=comm) 483 if preprocess: 484 self._preprocess(root)

~/miniconda3/envs/py38/lib/python3.8/site-packages/panel/layout/base.py in _get_model(self, doc, root, parent, comm) 110 if root is None: 111 root = model –> 112 objects = self._get_objects(model, [], doc, root, comm) 113 props = dict(self._init_properties(), objects=objects) 114 model.update(**self._process_param_change(props))

~/miniconda3/envs/py38/lib/python3.8/site-packages/panel/layout/base.py in _get_objects(self, model, old_objects, doc, root, comm) 100 else: 101 try: –> 102 child = pane._get_model(doc, root, model, comm) 103 except RerenderError: 104 return self._get_objects(model, current_objects[:i], doc, root, comm)

~/miniconda3/envs/py38/lib/python3.8/site-packages/panel/pane/holoviews.py in _get_model(self, doc, root, parent, comm) 239 plot = self.object 240 else: –> 241 plot = self._render(doc, comm, root) 242 243 plot.pane = self

~/miniconda3/envs/py38/lib/python3.8/site-packages/panel/pane/holoviews.py in _render(self, doc, comm, root) 304 kwargs[‘comm’] = comm 305 –> 306 return renderer.get_plot(self.object, **kwargs) 307 308 def _cleanup(self, root):

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/plotting/bokeh/renderer.py in get_plot(self_or_cls, obj, doc, renderer, **kwargs) 71 combining the bokeh model with another plot. 72 “”" —> 73 plot = super(BokehRenderer, self_or_cls).get_plot(obj, doc, renderer, **kwargs) 74 if plot.document is None: 75 plot.document = Document() if self_or_cls.notebook_context else curdoc()

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/plotting/renderer.py in get_plot(self_or_cls, obj, doc, renderer, comm, **kwargs) 218 219 # Initialize DynamicMaps with first data item –> 220 initialize_dynamic(obj) 221 222 if not renderer:

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/plotting/util.py in initialize_dynamic(obj) 250 continue 251 if not len(dmap): –> 252 dmap[dmap._initial_key()] 253 254

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/spaces.py in getitem(self, key) 1329 # Not a cross product and nothing cached so compute element. 1330 if cache is not None: return cache -> 1331 val = self._execute_callback(*tuple_key) 1332 if data_slice: 1333 val = self._dataslice(val, data_slice)

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/spaces.py in _execute_callback(self, *args) 1098 1099 with dynamicmap_memoization(self.callback, self.streams): -> 1100 retval = self.callback(*args, **kwargs) 1101 return self._style(retval) 1102

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/spaces.py in call(self, *args, **kwargs) 712 713 try: –> 714 ret = self.callable(*args, **kwargs) 715 except KeyError: 716 # KeyError is caught separately because it is used to signal

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/util/init.py in dynamic_operation(*key, **kwargs) 1016 1017 def dynamic_operation(*key, **kwargs): -> 1018 key, obj = resolve(key, kwargs) 1019 return apply(obj, *key, **kwargs) 1020

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/util/init.py in resolve(key, kwargs) 1005 elif isinstance(map_obj, DynamicMap) and map_obj._posarg_keys and not key: 1006 key = tuple(kwargs[k] for k in map_obj._posarg_keys) -> 1007 return key, map_obj[key] 1008 1009 def apply(element, *key, **kwargs):

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/spaces.py in getitem(self, key) 1329 # Not a cross product and nothing cached so compute element. 1330 if cache is not None: return cache -> 1331 val = self._execute_callback(*tuple_key) 1332 if data_slice: 1333 val = self._dataslice(val, data_slice)

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/spaces.py in _execute_callback(self, *args) 1098 1099 with dynamicmap_memoization(self.callback, self.streams): -> 1100 retval = self.callback(*args, **kwargs) 1101 return self._style(retval) 1102

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/spaces.py in call(self, *args, **kwargs) 712 713 try: –> 714 ret = self.callable(*args, **kwargs) 715 except KeyError: 716 # KeyError is caught separately because it is used to signal

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/util/init.py in dynamic_operation(*key, **kwargs) 1017 def dynamic_operation(*key, **kwargs): 1018 key, obj = resolve(key, kwargs) -> 1019 return apply(obj, *key, **kwargs) 1020 1021 operation = self.p.operation

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/util/init.py in apply(element, *key, **kwargs) 1009 def apply(element, *key, **kwargs): 1010 kwargs = dict(util.resolve_dependent_kwargs(self.p.kwargs), **kwargs) -> 1011 processed = self._process(element, key, kwargs) 1012 if (self.p.link_dataset and isinstance(element, Dataset) and 1013 isinstance(processed, Dataset) and processed._dataset is None):

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/util/init.py in _process(self, element, key, kwargs) 991 elif isinstance(self.p.operation, Operation): 992 kwargs = {k: v for k, v in kwargs.items() if k in self.p.operation.param} –> 993 return self.p.operation.process_element(element, key, **kwargs) 994 else: 995 return self.p.operation(element, **kwargs)

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/operation.py in process_element(self, element, key, **params) 192 self.p = param.ParamOverrides(self, params, 193 allow_extra_keywords=self._allow_extra_keywords) –> 194 return self._apply(element, key) 195 196

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/operation.py in _apply(self, element, key) 139 if not in_method: 140 element._in_method = True –> 141 ret = self._process(element, key) 142 if hasattr(element, ‘_in_method’) and not in_method: 143 element._in_method = in_method

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/operation/datashader.py in _process(self, element, key) 1496 1497 def _process(self, element, key=None): -> 1498 agg = rasterize._process(self, element, key) 1499 shaded = shade._process(self, agg, key) 1500 return shaded

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/operation/datashader.py in _process(self, element, key) 1475 if k in transform.param}) 1476 op._precomputed = self._precomputed -> 1477 element = element.map(op, predicate) 1478 self._precomputed = op._precomputed 1479

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/data/init.py in pipelined_fn(*args, **kwargs) 199 200 try: –> 201 result = method_fn(*args, **kwargs) 202 if PipelineMeta.disable: 203 return result

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/data/init.py in map(self, *args, **kwargs) 1214 1215 def map(self, *args, **kwargs): -> 1216 return super(Dataset, self).map(*args, **kwargs) 1217 map.doc = LabelledData.map.doc 1218

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/dimension.py in map(self, map_fn, specs, clone) 707 return deep_mapped 708 else: –> 709 return map_fn(self) if applies else self 710 711

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/operation.py in call(self, element, **kwargs) 212 elif ((self._per_element and isinstance(element, Element)) or 213 (not self._per_element and isinstance(element, ViewableElement))): –> 214 return self._apply(element) 215 elif ‘streams’ not in kwargs: 216 kwargs[‘streams’] = self.p.streams

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/core/operation.py in _apply(self, element, key) 139 if not in_method: 140 element._in_method = True –> 141 ret = self._process(element, key) 142 if hasattr(element, ‘_in_method’) and not in_method: 143 element._in_method = in_method

~/miniconda3/envs/py38/lib/python3.8/site-packages/holoviews/operation/datashader.py in _process(self, element, key) 937 agg_fn = self._get_aggregator(element, add_field=False) 938 for vd, xarr in arrays.items(): –> 939 rarray = cvs.raster(xarr, upsample_method=interp, 940 downsample_method=agg_fn) 941

~/miniconda3/envs/py38/lib/python3.8/site-packages/datashader/core.py in raster(self, source, layer, upsample_method, downsample_method, nan_value, agg, interpolate, chunksize, max_mem) 1131 dims = [ydim, xdim] 1132 attrs = dict(res=res[0]) -> 1133 if source._file_obj is not None and hasattr(source._file_obj, ‘nodata’): 1134 attrs[‘nodata’] = source._file_obj.nodata 1135

~/miniconda3/envs/py38/lib/python3.8/site-packages/xarray/core/common.py in getattr(self, name) 237 with suppress(KeyError): 238 return source[name] –> 239 raise AttributeError( 240 “{!r} object has no attribute {!r}”.format(type(self).name, name) 241 )

AttributeError: ‘DataArray’ object has no attribute ‘_file_obj’

Screenshots or screencasts of the bug in action

[philippjfr]

Closing since this is an upstream issue in datashader (see https://github.com/holoviz/datashader/issues/990). Upstream testing of the master branch of all supported data backends seems like a good idea though. Could one of you file an issue about that?

[jbednar]

@dev-eo , you should be able to avoid the problem by pinning xarray<0.17.0. We don’t have a proper fix yet, other than that.