Merge pull request #1873 from deepchem/rtd_fixes

# add these directories to sys.path here. If the directory is relative to the

# documentation root, use os.path.abspath to make it absolute, like shown here.

#

# import os

import os

import sys

import deepchem

# sys.path.insert(0, os.path.abspath('.'))

# -- Project information -----------------------------------------------------

  else:

    linespec = ""

  fn = relpath(fn, start=dirname(deepchem.__file__))

  fn = relpath(

      fn, start=os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

  return "https://github.com/deepchem/deepchem/blob/master/deepchem/%s%s" % (

      fn, linespec)