def test_trainer_shouldnt_crash(self):
label_key = "label"
feature_spec, _ = Datasets.parse_schema(self.schema_path)
all_features = {
name: tf.feature_column.numeric_column(name, default_value=.0)
for name in feature_spec.keys()
}
feature_columns = all_features.copy()
feature_columns.pop(label_key)
config = tf.estimator.RunConfig(tempfile.mkdtemp())
estimator = tf.estimator.LinearClassifier(
feature_columns=feature_columns.values(), config=config)
def split_features_label_fn(parsed_features):
label = parsed_features.pop(label_key)
return parsed_features, label
def get_in_fn(data):
raw_feature_spec = tf.feature_column.make_parse_example_spec(
all_features.values())
def in_fn():
dataset = Datasets.examples_via_feature_spec(
data, raw_feature_spec)
return dataset.map(split_features_label_fn)
return in_fn
estimator.train(get_in_fn(self.train_data)).evaluate(
get_in_fn(self.eval_data))
def train(_):
import tempfile
config = tf.estimator.RunConfig(tempfile.mkdtemp())
train_data_dir = get_data_dir("train")
schema_path = os.path.join(train_data_dir, "_inferred_schema.pb")
feature_spec, _ = Datasets.parse_schema(schema_path)
# we use OrderedDict and sorted keys for features for determinism
all_features = OrderedDict([
(name, tf.feature_column.numeric_column(name, default_value=.0))
for name in sorted(feature_spec.keys())
])
feature_columns = all_features.copy()
label_keys = sorted(
[l for l in set(feature_columns.keys()) if l.startswith("class_name")])
for l in label_keys:
feature_columns.pop(l)
def split_features_label_fn(spec):
# Canned TF's LinearClassifier requires label to be a single integer, Featran gives us
# one hot encoding for class, thus we need to convert one hot encoding to single integer
labels = tf.concat([[spec.pop(l)] for l in label_keys], axis=0)
label = tf.argmax(labels, axis=0)
# Get the rest of the features out of the spec
return spec, label
def get_in_fn(data):
raw_feature_spec = tf.feature_column.make_parse_example_spec(
all_features.values())
def in_fn():
dataset = Datasets.examples_via_feature_spec(
data, raw_feature_spec)
return dataset.map(split_features_label_fn)
return in_fn
classifier = tf.estimator.LinearClassifier(
feature_columns=feature_columns.values(), n_classes=3, config=config)
train_data = os.path.join(train_data_dir, "part-*")
eval_data = os.path.join(get_data_dir("eval"), "part-*")
classifier.train(get_in_fn(train_data)).evaluate(get_in_fn(eval_data))