diff --git a/.travis.yml b/.travis.yml
index 13d9899e9..1f3b19ae6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -56,6 +56,7 @@ matrix:
         - RAY_GCS_SERVICE_ENABLED=false
       install:
         - eval `python $TRAVIS_BUILD_DIR/ci/travis/determine_tests_to_run.py`
+        - if [ $RAY_CI_ONLY_RLLIB_AFFECTED == "1" ]; then exit; fi
         - ./ci/travis/install-bazel.sh
         - ./ci/suppress_output ./ci/travis/install-dependencies.sh
         - export PATH="$HOME/miniconda/bin:$PATH"
@@ -63,6 +64,7 @@ matrix:
         - ./ci/suppress_output ./ci/travis/install-cython-examples.sh
         - eval "$(curl -sL https://raw.githubusercontent.com/travis-ci/gimme/master/gimme | GIMME_GO_VERSION=master bash)"
       script:
+        - if [ $RAY_CI_ONLY_RLLIB_AFFECTED == "1" ]; then exit; fi
         - ./ci/suppress_output bash src/ray/test/run_core_worker_tests.sh
         - ./ci/suppress_output bash streaming/src/test/run_streaming_queue_test.sh
         - ./java/test.sh
@@ -76,6 +78,7 @@ matrix:
         - RAY_GCS_SERVICE_ENABLED=false
       install:
         - eval `python $TRAVIS_BUILD_DIR/ci/travis/determine_tests_to_run.py`
+        - if [ $RAY_CI_ONLY_RLLIB_AFFECTED == "1" ]; then exit; fi
         - ./ci/travis/install-bazel.sh
         - ./ci/suppress_output ./ci/travis/install-dependencies.sh
         - export PATH="$HOME/miniconda/bin:$PATH"
@@ -83,6 +86,7 @@ matrix:
         - ./ci/suppress_output ./ci/travis/install-cython-examples.sh
         - eval "$(curl -sL https://raw.githubusercontent.com/travis-ci/gimme/master/gimme | GIMME_GO_VERSION=master bash)"
       script:
+        - if [ $RAY_CI_ONLY_RLLIB_AFFECTED == "1" ]; then exit; fi
         - export PATH="$HOME/miniconda/bin:$PATH"
         - ./ci/keep_alive bazel test --spawn_strategy=local --flaky_test_attempts=3 --nocache_test_results --test_verbose_timeout_warnings --progress_report_interval=100 --show_progress_rate_limit=100 --show_timestamps --test_output=errors --test_tag_filters=-jenkins_only python/ray/tests/...
 
@@ -152,7 +156,6 @@ matrix:
 
       script:
         - if [ $RAY_CI_LINUX_WHEELS_AFFECTED != "1" ]; then exit; fi
-
         # Explicitly sleep 60 seconds for logs to go through
         - ./ci/travis/test-wheels.sh || { cat /tmp/ray/session_latest/logs/* && sleep 60 && false; }
       cache: false
@@ -318,7 +321,7 @@ matrix:
 
 install:
   - eval `python $TRAVIS_BUILD_DIR/ci/travis/determine_tests_to_run.py`
-  - if [ $RAY_CI_SERVE_AFFECTED != "1" ] && [ $RAY_CI_TUNE_AFFECTED != "1" ] && [ $RAY_CI_RLLIB_AFFECTED != "1" ] && [ $RAY_CI_PYTHON_AFFECTED != "1" ]; then exit; fi
+  - if [ $RAY_CI_SERVE_AFFECTED != "1" ] && [ $RAY_CI_TUNE_AFFECTED != "1" ] && [ $RAY_CI_PYTHON_AFFECTED != "1" ]; then exit; fi
 
   - ./ci/travis/install-bazel.sh
   - ./ci/suppress_output ./ci/travis/install-dependencies.sh
@@ -329,6 +332,8 @@ install:
   - eval "$(curl -sL https://raw.githubusercontent.com/travis-ci/gimme/master/gimme | GIMME_GO_VERSION=master bash)"
 
 script:
+  - if [ $RAY_CI_SERVE_AFFECTED != "1" ] && [ $RAY_CI_TUNE_AFFECTED != "1" ] && [ $RAY_CI_PYTHON_AFFECTED != "1" ]; then exit; fi
+
   - export PATH="$HOME/miniconda/bin:$PATH"
 
   # raylet integration tests
diff --git a/ci/travis/determine_tests_to_run.py b/ci/travis/determine_tests_to_run.py
index bbdd1f13b..e653277f4 100644
--- a/ci/travis/determine_tests_to_run.py
+++ b/ci/travis/determine_tests_to_run.py
@@ -33,8 +33,9 @@ def list_changed_files(commit_range):
 if __name__ == "__main__":
 
     RAY_CI_TUNE_AFFECTED = 0
-    RAY_CI_RLLIB_AFFECTED = 0
-    RAY_CI_RLLIB_FULL_AFFECTED = 0
+    RAY_CI_ONLY_RLLIB_AFFECTED = 0  # Whether only RLlib is affected.
+    RAY_CI_RLLIB_AFFECTED = 0  # Whether RLlib minimal tests should be run.
+    RAY_CI_RLLIB_FULL_AFFECTED = 0  # Whether full RLlib tests should be run.
     RAY_CI_SERVE_AFFECTED = 0
     RAY_CI_JAVA_AFFECTED = 0
     RAY_CI_PYTHON_AFFECTED = 0
@@ -129,10 +130,19 @@ if __name__ == "__main__":
         RAY_CI_STREAMING_PYTHON_AFFECTED = 1
         RAY_CI_STREAMING_JAVA_AFFECTED = 1
 
+    if not RAY_CI_TUNE_AFFECTED and not RAY_CI_SERVE_AFFECTED and \
+            not RAY_CI_JAVA_AFFECTED and not RAY_CI_PYTHON_AFFECTED and not \
+            RAY_CI_STREAMING_CPP_AFFECTED and \
+            not RAY_CI_STREAMING_PYTHON_AFFECTED and \
+            not RAY_CI_STREAMING_JAVA_AFFECTED:
+        RAY_CI_ONLY_RLLIB_AFFECTED = 1
+
     # Log the modified environment variables visible in console.
     for output_stream in [sys.stdout, sys.stderr]:
         _print = partial(print, file=output_stream)
         _print("export RAY_CI_TUNE_AFFECTED={}".format(RAY_CI_TUNE_AFFECTED))
+        _print("export RAY_CI_ONLY_RLLIB_AFFECTED={}"
+               .format(RAY_CI_ONLY_RLLIB_AFFECTED))
         _print("export RAY_CI_RLLIB_AFFECTED={}".format(RAY_CI_RLLIB_AFFECTED))
         _print("export RAY_CI_RLLIB_FULL_AFFECTED={}".format(
             RAY_CI_RLLIB_FULL_AFFECTED))
diff --git a/rllib/policy/rnn_sequencing.py b/rllib/policy/rnn_sequencing.py
index e55639fa2..a45c84845 100644
--- a/rllib/policy/rnn_sequencing.py
+++ b/rllib/policy/rnn_sequencing.py
@@ -158,7 +158,7 @@ def chop_into_sequences(episode_ids,
                         _extra_padding=0):
     """Truncate and pad experiences into fixed-length sequences.
 
-    Arguments:
+    Args:
         episode_ids (list): List of episode ids for each step.
         unroll_ids (list): List of identifiers for the sample batch. This is
             used to make sure sequences are cut between sample batches.