class_docstr: A scalable graph data structure. The SGraph data structure allows arbitrary
  dictionary attributes on vertices and edges, provides flexible vertex and
  edge query functions, and seamless transformation to and from
  :class:`~turicreate.SFrame`.
  
  There are several ways to create an SGraph. The simplest way is to make an
  empty SGraph then add vertices and edges with the :py:func:`add_vertices`
  and :py:func:`add_edges` methods. SGraphs can also be created from vertex
  and edge lists stored in :class:`~turicreate.SFrames`. Columns of these
  SFrames not used as vertex IDs are assumed to be vertex or edge attributes.
  
  Please see the `User Guide
  <https://apple.github.io/turicreate/docs/userguide/sgraph/sgraph.html>`_
  for a more detailed introduction to creating and working with SGraphs.
  
  Parameters
  ----------
  vertices : SFrame, optional
      Vertex data. Must include an ID column with the name specified by
      the `vid_field` parameter. Additional columns are treated as vertex
      attributes.
  
  edges : SFrame, optional
      Edge data. Must include source and destination ID columns as specified
      by `src_field` and `dst_field` parameters. Additional columns are treated
      as edge attributes.
  
  vid_field : str, optional
      The name of vertex ID column in the `vertices` SFrame.
  
  src_field : str, optional
      The name of source ID column in the `edges` SFrame.
  
  dst_field : str, optional
      The name of destination ID column in the `edges` SFrame.
  
  See Also
  --------
  SFrame
  
  Notes
  -----
  - SGraphs are *structurally immutable*. In the example below, the
    :func:`~add_vertices` and :func:`~add_edges` commands both return a new
    graph; the old graph gets garbage collected.
  
  Examples
  --------
  >>> from turicreate import SGraph, Vertex, Edge
  >>> g = SGraph()
  >>> verts = [Vertex(0, attr={'breed': 'labrador'}),
               Vertex(1, attr={'breed': 'labrador'}),
               Vertex(2, attr={'breed': 'vizsla'})]
  >>> g = g.add_vertices(verts)
  >>> g = g.add_edges(Edge(1, 2))
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docstr: Save the SGraph to disk. If the graph is saved in binary format, the
  graph can be re-loaded using the :py:func:`load_sgraph` method.
  Alternatively, the SGraph can be saved in JSON format for a
  human-readable and portable representation.
  
  Parameters
  ----------
  filename : string
      Filename to use when saving the file. It can be either a local or
      remote url.
  
  format : {'auto', 'binary', 'json'}, optional
      File format. If not specified, the format is detected automatically
      based on the filename. Note that JSON format graphs cannot be
      re-loaded with :py:func:`load_sgraph`.
  
  See Also
  --------
  load_sgraph
  
  Examples
  --------
  >>> g = turicreate.SGraph()
  >>> g = g.add_vertices([turicreate.Vertex(i) for i in range(5)])
  
  Save and load in binary format.
  
  >>> g.save('mygraph')
  >>> g2 = turicreate.load_sgraph('mygraph')
  
  Save in JSON format.
  
  >>> g.save('mygraph.json', format='json')
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code: def save(self, filename, format="auto"):
      """
      Save the SGraph to disk. If the graph is saved in binary format, the
      graph can be re-loaded using the :py:func:`load_sgraph` method.
      Alternatively, the SGraph can be saved in JSON format for a
      human-readable and portable representation.
  
      Parameters
      ----------
      filename : string
          Filename to use when saving the file. It can be either a local or
          remote url.
  
      format : {'auto', 'binary', 'json'}, optional
          File format. If not specified, the format is detected automatically
          based on the filename. Note that JSON format graphs cannot be
          re-loaded with :py:func:`load_sgraph`.
  
      See Also
      --------
      load_sgraph
  
      Examples
      --------
      >>> g = turicreate.SGraph()
      >>> g = g.add_vertices([turicreate.Vertex(i) for i in range(5)])
  
      Save and load in binary format.
  
      >>> g.save('mygraph')
      >>> g2 = turicreate.load_sgraph('mygraph')
  
      Save in JSON format.
  
      >>> g.save('mygraph.json', format='json')
      """
  
      if format == "auto":
          if filename.endswith((".json", ".json.gz")):
              format = "json"
          else:
              format = "binary"
  
      if format not in ["binary", "json", "csv"]:
          raise ValueError(
              "Invalid format: %s. Supported formats are: %s"
              % (format, ["binary", "json", "csv"])
          )
      with cython_context():
          self.__proxy__.save_graph(
              _make_internal_url(filename), format
          )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from .._connect import main
  from .sframe import SFrame
  from .sarray import SArray
  from .gframe import GFrame, VERTEX_GFRAME, EDGE_GFRAME
  from .._cython.cy_graph import UnityGraphProxy
  from .._cython.context import debug_trace
  from ..util import _is_non_string_iterable, _make_internal_url
  from .._deps import pandas
  from .._deps import HAS_PANDAS
  import inspect
  import copy
  import sys
label_desc: Use image node_id 19 for calling the SGraph obj's underlying member method code with example usage: obj.save(filename, format) without return types