update docs

.travis.yml

@@ -41,10 +41,9 @@ matrix:
 
 install:
 - pip install -U pip    # the pip version on travis is too old
-- pip install flake8 scikit-image opencv-python lmdb h5py msgpack
 - pip install .
+- pip install flake8 scikit-image opencv-python lmdb h5py msgpack
   # check that dataflow can be imported alone
-- python -c "import pyarrow"
 - python -c "import tensorpack.dataflow"
 - ./tests/install-tensorflow.sh
 
@@ -66,11 +65,6 @@ script:
 - cd $TRAVIS_BUILD_DIR  # go back to root so that deploy may work
 
 notifications:
-  email:
-    recipients:
-      - ppwwyyxxc@gmail.com
-    on_success: never
-    on_failure: always
   webhooks:
     urls:
       - https://webhooks.gitter.im/e/cede9dbbf6630b3704b3

tensorpack/train/base.py

@@ -100,6 +100,19 @@ class Trainer(object):
     Certain callbacks will only be run by chief worker.
     """
 
+    sess = None
+    """
+    The ``tf.Session`` object the trainer is using.
+    Available after :meth:`initialize()`.
+    """
+
+    hooked_sess = None
+    """
+    The ``tf.train.MonitoredSession`` object the trainer is using.
+    It contains all the hooks the callbacks have registered.
+    Available after :meth:`initialize()`.
+    """
+
     def __init__(self):
         self._callbacks = []
         self.loop = TrainLoop()