bug fix in dataset dir. add extra requires

opt-requirements.txt

 pillow
 scipy
-nltk
 h5py
 tornado; python_version < '3.0'
 lmdb

setup.py

 from setuptools import setup
-import sys
 
-req = ['numpy',
+req = [
+    'numpy',
     'six',
     'termcolor',
     'tqdm>4.11.1',
     'msgpack-python',
     'msgpack-numpy',
-       'pyzmq'
-       ]
-if sys.version_info.major == 2:
-    req.extend(['subprocess32', 'functools32'])
+    'pyzmq',
+    'subprocess32;python_version<"3.0"',
+    'functools32;python_version<"3.0"',
+]
+extra_req = [
+    'pillow',
+    'scipy',
+    'h5py',
+    'lmdb',
+    'matplotlib',
+    'scikit-learn',
+    'tornado;python_version<"3.0"',
+]
 
 # TODO:
-# setup_requires, extras_requires, scripts
-setup(install_requires=req)
+# setup_requires, scripts
+setup(
+    install_requires=req,
+    extras_require={
+        'all': extra_req
+    },
+)

tensorpack/utils/fs.py

@@ -82,7 +82,7 @@ def get_dataset_path(*args):
     if d is None:
         old_d = os.path.abspath(os.path.join(
             os.path.dirname(__file__), '..', 'dataflow', 'dataset'))
-        old_d_ret = os.path.join(d, *args)
+        old_d_ret = os.path.join(old_d, *args)
         new_d = os.path.expanduser('~/tensorpack_data')
         if os.path.isdir(old_d_ret):
             # there is an old dir containing data, use it for back-compat