def show(self, variable=None):
super(IPythonTarget, self).show(variable)
selected = self.state.get_selected_variable()
if selected is None:
raise BaseException(
'No object is currently selected for viewing in Canvas. Call .show on a GraphLab Create object to show output in IPython Notebook or Jupyter Notebook.'
)
(name, view) = selected
assert (type(name) == tuple)
assert (isinstance(view, graphlab.canvas.views.base.BaseView))
data = None
selected_variable = graphlab.canvas.handlers.expand_selected_variable(
self.state)
data = {
'selected_variable': selected_variable,
'ipython': True,
}
data.update(view.get_staticdata())
import IPython
IPython.core.display.display_javascript(
IPython.core.display.Javascript(
data=self.__makeJS(_to_json(data), view.get_js_file(),
view.get_js_component()),
css=[
'//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/css/font-awesome.min.css',
self.get_asset_url() + 'css/canvas.css'
]))
def write(self, chunk):
"""
Make sure we write chunks as valid JSON (by default Tornado does not -- it includes Infinity and NaN)
"""
if isinstance(chunk, dict):
chunk = _to_json(chunk)
self.set_header("Content-Type", "application/json; charset=UTF-8")
super(JSONResponseHandler, self).write(chunk)
def write(self, chunk):
"""
Make sure we write chunks as valid JSON (by default Tornado does not -- it includes Infinity and NaN)
"""
if isinstance(chunk, dict):
chunk = _to_json(chunk)
self.set_header("Content-Type", "application/json; charset=UTF-8")
super(JSONResponseHandler, self).write(chunk)
def show(self, variable=None):
super(IPythonTarget, self).show(variable)
selected = self.state.get_selected_variable()
if selected is None:
raise BaseException('No object is currently selected for viewing in Canvas. Call .show on a GraphLab Create object to show output in IPython Notebook.')
(name, view) = selected
assert(type(name) == tuple)
assert(isinstance(view, graphlab.canvas.views.base.BaseView))
data = None
selected_variable = graphlab.canvas.handlers.expand_selected_variable(self.state)
data = {
'selected_variable': selected_variable,
'ipython': True,
}
data.update(view.get_staticdata())
import IPython
IPython.core.display.display_javascript(
IPython.core.display.Javascript(
data=self.__makeJS(_to_json(data), view.get_js_file(), view.get_js_component()),
css=['//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/css/font-awesome.min.css', self.get_asset_url() + 'css/canvas.css']
)
)
def _encode_value(value):
"""
This will truncate at 24 characters with ellipses as necessary, will format
list/dict/array as JSON before truncating, and will replace bad characters
in non-utf8 strings.
Parameters
----------
value: string, float, long, int, datetime, list, dict, Image
object to be recurisvly encoded into JSON
Returns
-------
plain_object: list, dict
mixed object with all SFrames and SArrays cast into list/dicts
Called to encode a single value (at row/col) from the SFrame
or SArray as a JSON string. This will truncate at 24 characters
with ellipses as necessary, will format list/dict/array as JSON
before truncating, and will replace bad characters in non-utf8 strings.
"""
# leave numbers alone
if isinstance(value, (int, long, float)):
return value
# leave Nones alone (they turn into null in JSON)
if value is None:
return value
# convert datetime to str
if isinstance(value, datetime.datetime):
# return, don't go through truncation
return str(value)
# represent image as base64-encoded bytes
import binascii
from graphlab.data_structures.image import Image
if isinstance(value, Image):
image_format = None
if value._format_enum == 0:
image_format = 'jpeg'
elif value._format_enum == 1:
image_format = 'png'
elif value._format_enum == 2:
image_format = 'raw'
if image_format is not None:
ret = {
'type': 'image',
'width': value._width,
'height': value._height,
'channels': value._channels,
'format': image_format,
'id': id(value)
}
if image_format in ('jpeg', 'png'):
ret.update({
'value':
'image/%s;base64,%s' %
(image_format, binascii.b2a_base64(value._image_data))
})
elif image_format == 'raw':
ret.update({'value': list(value._image_data)})
return ret
# fallback case for images the browser does not know how to display
# just convert to str and treat like any other type
value = str(value)
# convert strings to unicode (assumes utf-8 encoding, replaces invalid
# characters with ?
if isinstance(value, str) and sys.version_info.major == 2:
value = unicode(value, encoding='utf-8', errors='replace')
# get the array into a list so it is JSON serializable
if isinstance(value, array.array):
value = value.tolist()
# truncate to 10 elements first
if isinstance(value, (array.array, list)):
value = value[:10]
elif isinstance(value, dict):
keys = value.keys()[:10]
truncated = {}
for key in keys:
truncated[key] = value[key]
value = truncated
# get dict/list values properly encoded inside before dumping to str
if isinstance(value, list):
value = [_encode_value(v) for v in value]
elif isinstance(value, dict):
value = {
_encode_value(k): _encode_value(v)
for (k, v) in six.iteritems(value)
}
# json serialize dict/list types to convert to string
if isinstance(value, (dict, list)):
value = _to_json(value)
# truncate via textwrap (will break on word boundaries if possible)
wrapped = textwrap.wrap(value, 18)
if len(wrapped) == 0:
return ''
return '%s%s' % (wrapped[0], '' if len(wrapped) == 1 else ' ...')
def _encode_value(value):
"""
This will truncate at 24 characters with ellipses as necessary, will format
list/dict/array as JSON before truncating, and will replace bad characters
in non-utf8 strings.
Parameters
----------
value: string, float, long, int, datetime, list, dict, Image
object to be recurisvly encoded into JSON
Return
------
plain_object: list, dict
mixed object with all SFrames and SArrays cast into list/dicts
Called to encode a single value (at row/col) from the SFrame
or SArray as a JSON string. This will truncate at 24 characters
with ellipses as necessary, will format list/dict/array as JSON
before truncating, and will replace bad characters in non-utf8 strings.
"""
# leave numbers alone
if isinstance(value, (int, long, float)):
return value
# leave Nones alone (they turn into null in JSON)
if value is None:
return value
# convert datetime to str
if isinstance(value, datetime.datetime):
# return, don't go through truncation
return str(value)
# represent image as base64-encoded bytes
import binascii
from graphlab.data_structures.image import Image
if isinstance(value, Image):
image_format = None
if value._format_enum == 0:
image_format = 'jpeg'
elif value._format_enum == 1:
image_format = 'png'
elif value._format_enum == 2:
image_format = 'raw'
if image_format is not None:
ret = {
'type': 'image',
'width': value._width,
'height': value._height,
'channels': value._channels,
'format': image_format,
'id': id(value)
}
if image_format in ('jpeg', 'png'):
ret.update({
'value': 'image/%s;base64,%s' % (image_format, binascii.b2a_base64(value._image_data))
})
elif image_format == 'raw':
ret.update({
'value': list(value._image_data)
})
return ret
# fallback case for images the browser does not know how to display
# just convert to str and treat like any other type
value = str(value)
# convert strings to unicode (assumes utf-8 encoding, replaces invalid
# characters with ?
if isinstance(value, str):
value = unicode(value, encoding='utf-8', errors='replace')
# get the array into a list so it is JSON serializable
if isinstance(value, array.array):
value = value.tolist()
# truncate to 10 elements first
if isinstance(value, (array.array, list)):
value = value[:10]
elif isinstance(value, dict):
keys = value.keys()[:10]
truncated = {}
for key in keys:
truncated[key] = value[key]
value = truncated
# get dict/list values properly encoded inside before dumping to str
if isinstance(value, list):
value = [_encode_value(v) for v in value]
elif isinstance(value, dict):
value = {_encode_value(k): _encode_value(v) for (k,v) in value.iteritems()}
# json serialize dict/list types to convert to string
if isinstance(value, (dict, list)):
value = _to_json(value)
# truncate via textwrap (will break on word boundaries if possible)
wrapped = textwrap.wrap(value, 18)
if len(wrapped) == 0:
return ''
return '%s%s' % (
wrapped[0],
'' if len(wrapped) == 1 else ' ...'
)