OpenCog Python Client: Sample IPython Notebook¶

Launch an OpenCog server as a background process¶

Important: The CogServer must be running in the background and the REST API must be loaded before running this notebook.

In [3]:

%%capture
import opencog as opencog
server = opencog.Server()
#server.start()

Import a Scheme file with a test dataset¶

In [4]:

opencog.clear_atomspace()
opencog.load_scheme_files(["python/pln/examples/tuffy/smokes/smokes.scm"])

Perform example atomspace operations: display the number of atoms, and inspect some of them¶

In [5]:

print("The atomspace contains {0} atoms.".format(len(opencog.atomspace())))

The atomspace contains 46 atoms.

In [6]:

atomspace = opencog.atomspace()
for handle, atom in atomspace.iteritems():
    if atom['type'] == 'ConceptNode':
        print("ConceptNode #{0} is '{1}'".
              format(handle, atom['name']))
    if atom['type'] == 'EvaluationLink':
        print("EvaluationLink #{0} refers to a predicate '{1}'".
              format(handle, atomspace[atom['outgoing'][0]]['name']))

ConceptNode #60 is 'Anna'
ConceptNode #61 is 'Bob'
ConceptNode #62 is 'Edward'
ConceptNode #63 is 'Frank'
ConceptNode #64 is 'Gary'
ConceptNode #65 is 'Helen'
EvaluationLink #68 refers to a predicate 'smokes'
EvaluationLink #69 refers to a predicate 'cancer'
EvaluationLink #74 refers to a predicate 'friends'
EvaluationLink #76 refers to a predicate 'smokes'
EvaluationLink #78 refers to a predicate 'smokes'
EvaluationLink #82 refers to a predicate 'friends'
EvaluationLink #84 refers to a predicate 'friends'
EvaluationLink #86 refers to a predicate 'friends'
EvaluationLink #88 refers to a predicate 'friends'
EvaluationLink #90 refers to a predicate 'friends'
EvaluationLink #92 refers to a predicate 'smokes'
EvaluationLink #94 refers to a predicate 'smokes'
EvaluationLink #97 refers to a predicate 'cancer'
EvaluationLink #100 refers to a predicate 'cancer'

Run an example Scheme command: check the type of an atom and display the result¶

In [7]:

print("This atom is of type {0}".
      format(opencog.scheme('(cog-type (ConceptNode "Bob"))')))

This atom is of type ConceptNode

Display a graphical rendering of the atomspace¶

In [8]:

import graphics
graphics.render_image(opencog.dump_atomspace_dot(), 1)

In [9]:

from IPython.core.display import Image
Image(filename='images/00001.png', width=500) 

Out[9]: