Unlimit the vdims for a variety of elements

[ahuang11]

Still working on making quadmesh work (can't seem to figure it out)...

<xarray.Dataset>
Dimensions:  (lat: 25, lon: 53)
Coordinates:
  * lat      (lat) float32 75.0 72.5 70.0 67.5 65.0 ... 25.0 22.5 20.0 17.5 15.0
  * lon      (lon) float32 200.0 202.5 205.0 207.5 ... 322.5 325.0 327.5 330.0
    time     datetime64[ns] 2013-01-01
Data variables:
    air      (lat, lon) float32 241.2 242.5 243.5 244.0 ... 296.9 296.79 296.6
    air2     (lat, lon) float32 482.4 485.0 487.0 488.0 ... 593.8 593.58 593.2
Attributes:
    Conventions:  COARDS
    title:        4x daily NMC reanalysis (1948)
    description:  Data is from NMC initialized reanalysis\n(4x/day).  These a...
    platform:     Model
    references:   http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanaly...
['lon', 'lat']
['air', 'air2']
<xarray.Dataset>
Dimensions:  (lat: 25, lon: 53)
Coordinates:
  * lat      (lat) float32 75.0 72.5 70.0 67.5 65.0 ... 25.0 22.5 20.0 17.5 15.0
  * lon      (lon) float32 200.0 202.5 205.0 207.5 ... 322.5 325.0 327.5 330.0
    time     datetime64[ns] 2013-01-01
Data variables:
    air      (lat, lon) float32 241.2 242.5 243.5 244.0 ... 296.9 296.79 296.6
    air2     (lat, lon) float32 482.4 485.0 487.0 488.0 ... 593.8 593.58 593.2
Attributes:
    Conventions:  COARDS
    title:        4x daily NMC reanalysis (1948)
    description:  Data is from NMC initialized reanalysis\n(4x/day).  These a...
    platform:     Model
    references:   http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanaly...
[Dimension('lon'), Dimension('lat')]
[Dimension('air'), Dimension('air2')]
(array([[-160. , -157.5, -155. , ...,  -35. ,  -32.5,  -30. ],
       [-160. , -157.5, -155. , ...,  -35. ,  -32.5,  -30. ],
       [-160. , -157.5, -155. , ...,  -35. ,  -32.5,  -30. ],
       ...,
       [-160. , -157.5, -155. , ...,  -35. ,  -32.5,  -30. ],
       [-160. , -157.5, -155. , ...,  -35. ,  -32.5,  -30. ],
       [-160. , -157.5, -155. , ...,  -35. ,  -32.5,  -30. ]]), array([[15. , 15. , 15. , ..., 15. , 15. , 15. ],
       [17.5, 17.5, 17.5, ..., 17.5, 17.5, 17.5],
       [20. , 20. , 20. , ..., 20. , 20. , 20. ],
       ...,
       [70. , 70. , 70. , ..., 70. , 70. , 70. ],
       [72.5, 72.5, 72.5, ..., 72.5, 72.5, 72.5],
       [75. , 75. , 75. , ..., 75. , 75. , 75. ]]), array([[296.29   , 296.79   , 297.1    , ..., 296.9    , 296.79   ,
        296.6    ],
       [295.9    , 296.19998, 296.79   , ..., 295.9    , 295.9    ,
        295.19998],
       [296.6    , 296.19998, 296.4    , ..., 295.4    , 295.1    ,
        294.69998],
       ...,
       [250.     , 249.79999, 248.89   , ..., 233.2    , 236.39   ,
        241.7    ],
       [243.79999, 244.5    , 244.7    , ..., 232.79999, 235.29999,
        239.29999],
       [241.2    , 242.5    , 243.5    , ..., 232.79999, 235.5    ,
        238.59999]], dtype=float32))
[Dimension('lon'), Dimension('lat')]
[Dimension('air'), Dimension('air2')]
---------------------------------------------------------------------------
DataError                                 Traceback (most recent call last)
~/anaconda3/lib/python3.6/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:

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/dimension.py in _repr_mimebundle_(self, include, exclude)
   1289         combined and returned.
   1290         """
-> 1291         return Store.render(self)
   1292 
   1293 

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/options.py in render(cls, obj)
   1311         data, metadata = {}, {}
   1312         for hook in hooks:
-> 1313             ret = hook(obj)
   1314             if ret is None:
   1315                 continue

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/ipython/display_hooks.py in pprint_display(obj)
    270     if not ip.display_formatter.formatters['text/plain'].pprint:
    271         return None
--> 272     return display(obj, raw_output=True)
    273 
    274 

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/ipython/display_hooks.py in display(obj, raw_output, **kwargs)
    240     elif isinstance(obj, (CompositeOverlay, ViewableElement)):
    241         with option_state(obj):
--> 242             output = element_display(obj)
    243     elif isinstance(obj, (Layout, NdLayout, AdjointLayout)):
    244         with option_state(obj):

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/ipython/display_hooks.py in wrapped(element)
    140         try:
    141             max_frames = OutputSettings.options['max_frames']
--> 142             mimebundle = fn(element, max_frames=max_frames)
    143             if mimebundle is None:
    144                 return {}, {}

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/ipython/display_hooks.py in element_display(element, max_frames)
    186         return None
    187 
--> 188     return render(element)
    189 
    190 

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/ipython/display_hooks.py in render(obj, **kwargs)
     63         renderer = renderer.instance(fig='png')
     64 
---> 65     return renderer.components(obj, **kwargs)
     66 
     67 

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/bokeh/renderer.py in components(self, obj, fmt, comm, **kwargs)
    276         # Bokeh has to handle comms directly in <0.12.15
    277         comm = False if bokeh_version < '0.12.15' else comm
--> 278         return super(BokehRenderer, self).components(obj,fmt, comm, **kwargs)
    279 
    280 

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/renderer.py in components(self, obj, fmt, comm, **kwargs)
    319             plot = obj
    320         else:
--> 321             plot, fmt = self._validate(obj, fmt)
    322 
    323         widget_id = None

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/renderer.py in _validate(self, obj, fmt, **kwargs)
    218         if isinstance(obj, tuple(self.widgets.values())):
    219             return obj, 'html'
--> 220         plot = self.get_plot(obj, renderer=self, **kwargs)
    221 
    222         fig_formats = self.mode_formats['fig'][self.mode]

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/bokeh/renderer.py in get_plot(self_or_cls, obj, doc, renderer, **kwargs)
    161             curdoc().theme = self_or_cls.theme
    162         doc.theme = self_or_cls.theme
--> 163         plot = super(BokehRenderer, self_or_cls).get_plot(obj, renderer, **kwargs)
    164         plot.document = doc
    165         return plot

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/renderer.py in get_plot(self_or_cls, obj, renderer, **kwargs)
    205             init_key = tuple(v if d is None else d for v, d in
    206                              zip(plot.keys[0], defaults))
--> 207             plot.update(init_key)
    208         else:
    209             plot = obj

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/plot.py in update(self, key)
    589     def update(self, key):
    590         if len(self) == 1 and ((key == 0) or (key == self.keys[0])) and not self.drawn:
--> 591             return self.initialize_plot()
    592         item = self.__getitem__(key)
    593         self.traverse(lambda x: setattr(x, '_updated', True))

/mnt/c/Users/sephi/GOOGLE~1/Bash/geoviews/geoviews/plotting/bokeh/plot.py in initialize_plot(self, ranges, plot, plots, source)
     86     def initialize_plot(self, ranges=None, plot=None, plots=None, source=None):
     87         opts = {} if isinstance(self, HvOverlayPlot) else {'source': source}
---> 88         fig = super(GeoPlot, self).initialize_plot(ranges, plot, plots, **opts)
     89         if self.geographic and self.show_bounds and not self.overlaid:
     90             from . import GeoShapePlot

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/bokeh/element.py in initialize_plot(self, ranges, plot, plots, source)
    948         self.handles['plot'] = plot
    949 
--> 950         self._init_glyphs(plot, element, ranges, source)
    951         if not self.overlaid:
    952             self._update_plot(key, plot, style_element)

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/plotting/bokeh/element.py in _init_glyphs(self, plot, element, ranges, source)
    899         else:
    900             style = self.style[self.cyclic_index]
--> 901             data, mapping, style = self.get_data(element, ranges, style)
    902             current_id = element._plot_id
    903         if source is None:

/mnt/c/Users/sephi/GOOGLE~1/Bash/geoviews/geoviews/plotting/bokeh/plot.py in get_data(self, element, ranges, style)
    130         proj = self.projection
    131         if self._project_operation and self.geographic:
--> 132             element = self._project_operation(element, projection=proj)
    133         return super(GeoPlot, self).get_data(element, ranges, style)
    134 

~/anaconda3/lib/python3.6/site-packages/param/parameterized.py in __new__(class_, *args, **params)
   2029         inst = class_.instance()
   2030         inst.param._set_name(class_.__name__)
-> 2031         return inst.__call__(*args,**params)
   2032 
   2033     def __call__(self,*args,**kw):

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/operation.py in __call__(self, element, **params)
    161                                 operation=self, kwargs=params)
    162         elif isinstance(element, ViewableElement):
--> 163             processed = self._apply(element)
    164         elif isinstance(element, DynamicMap):
    165             if any((not d.values) for d in element.kdims):

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/operation.py in _apply(self, element, key)
    119         for hook in self._preprocess_hooks:
    120             kwargs.update(hook(self, element))
--> 121         ret = self._process(element, key)
    122         for hook in self._postprocess_hooks:
    123             ret = hook(self, ret, **kwargs)

/mnt/c/Users/sephi/GOOGLE~1/Bash/geoviews/geoviews/operation/projection.py in _process(self, element, key)
     38 
     39     def _process(self, element, key=None):
---> 40         return element.map(self._process_element, self.supported_types)
     41 
     42 

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/dimension.py in map(self, map_fn, specs, clone)
    733             return deep_mapped
    734         else:
--> 735             return map_fn(self) if applies else self
    736 
    737 

/mnt/c/Users/sephi/GOOGLE~1/Bash/geoviews/geoviews/operation/projection.py in _process_element(self, element)
    271 
    272         params = get_param_values(element)
--> 273         return QuadMesh((PX, PY, zs), crs=self.projection, **params)
    274 
    275 

/mnt/c/Users/sephi/GOOGLE~1/Bash/geoviews/geoviews/element/geo.py in __init__(self, data, kdims, vdims, **kwargs)
    101 
    102 
--> 103     def clone(self, data=None, shared_data=True, new_type=None,
    104               *args, **overrides):
    105         if 'crs' not in overrides and (not new_type or isinstance(new_type, _Element)):

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/element/raster.py in __init__(self, data, kdims, vdims, **params)
    807 
    808     def __init__(self, data, kdims=None, vdims=None, **params):
--> 809         super(QuadMesh, self).__init__(data, kdims, vdims, **params)
    810         if not self.interface.gridded:
    811             raise DataError("%s type expects gridded data, %s is columnar."

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/data/__init__.py in __init__(self, data, kdims, vdims, **kwargs)
    217         validate_vdims = kwargs.pop('_validate_vdims', True)
    218         initialized = Interface.initialize(type(self), data, kdims, vdims,
--> 219                                            datatype=kwargs.get('datatype'))
    220         (data, self.interface, dims, extra_kws) = initialized
    221         super(Dataset, self).__init__(data, **dict(kwargs, **dict(dims, **extra_kws)))

/mnt/c/Users/sephi/GOOGLE~1/Bash/holoviews/holoviews/core/data/interface.py in initialize(cls, eltype, data, kdims, vdims, datatype)
    249                                   % (intfc.__name__, e))
    250                 error = ' '.join([error, priority_error])
--> 251             raise DataError(error)
    252 
    253         return data, interface, dims, extra_kws

DataError: None of the available storage backends were able to support the supplied data format.

[philippjfr]

What happens with additional vdims on RGB/HSV elements?

[jbednar]

Would be nice if those worked with hover but I suspect @jlstevens didn't support RGB for hovering at the Bokeh level.

[ahuang11]

Yes, hover doesn't do anything on RGB/HSV so I limited it back.

Also still don't really understand how to fix quadmesh geo=True with additional vdims:

import hvplot.xarray
import cartopy.crs as ccrs
import geoviews as gv
ds = xr.tutorial.load_dataset('air_temperature').isel(time=0)
ds['air2'] = ds['air'] * 2

# this doesn't work
ds.hvplot.quadmesh('lon', 'lat', z='air', hover_cols=['air2'], geo=True).options(projection=ccrs.PlateCarree())

# this works
ds.hvplot.quadmesh('lon', 'lat', z='air', geo=True).options(projection=ccrs.PlateCarree())

particularly I don't really get why/how
super(_Element, self).__init__(data, kdims=kdims, vdims=vdims, **kwargs) gets called three separate times, the second time converting ['lon', 'lat'] ['air', 'air2'] to [Dimension('lon'), Dimension('lat')] [Dimension('air'), Dimension('air2')] and third time retains that.

[philippjfr]

I'll merge for now, but you're right that QuadMesh likely needs further fixes.