tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/base_head.py

tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/multi_class_head.py

tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/regression_head.py

tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/binary_class_head.py

tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/multi_label_head.py

tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/sequential_head.py

tensorflow_estimator/python/estimator/canned/head.py
tensorflow_estimator/python/estimator/head/multi_head.py