diff --git a/fit_a_line/data/prepare_data.py b/fit_a_line/data/prepare_data.py
deleted file mode 100644
index 4a3782752c7964a7203e7e78afe1d36cd003037a..0000000000000000000000000000000000000000
--- a/fit_a_line/data/prepare_data.py
+++ /dev/null
@@ -1,108 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-from collections import Counter
-from urllib2 import urlopen
-import argparse
-import os
-import random
-import logging
-
-import numpy as np
-
-logging.basicConfig(level=logging.INFO)
-data_url = 'https://archive.ics.uci.edu/ml/machine' \
-           '-learning-databases/housing/housing.data'
-raw_data = 'housing.data'
-train_data = 'housing.train.npy'
-test_data = 'housing.test.npy'
-feature_names = [
-    'CRIM', 'ZN', 'INDUS', 'CHAS', 'NOX', 'RM', 'AGE', 'DIS', 'RAD', 'TAX',
-    'PTRATIO', 'B', 'LSTAT'
-]
-root_dir = os.path.abspath(os.pardir)
-
-
-def maybe_download(url, file_path):
-    if not os.path.exists(file_path):
-        logging.info('data doesn\'t exist on %s, download from [%s]' %
-                     (file_path, url))
-        resp = urlopen(url).read()
-        with open(file_path, 'w') as f:
-            f.write(resp)
-
-    logging.info('got raw housing data')
-
-
-def save_list():
-    with open('train.list', 'w') as f:
-        f.write('data/' + train_data + '\n')
-    with open('test.list', 'w') as f:
-        f.write('data/' + test_data + '\n')
-
-
-def feature_range(maximums, minimums):
-    import matplotlib
-    matplotlib.use('Agg')
-    import matplotlib.pyplot as plt
-    fig, ax = plt.subplots()
-    feature_num = len(maximums)
-    ax.bar(range(feature_num), maximums - minimums, color='r', align='center')
-    ax.set_title('feature scale')
-    plt.xticks(range(feature_num), feature_names)
-    plt.xlim([-1, feature_num])
-    fig.set_figheight(6)
-    fig.set_figwidth(10)
-    fig.savefig('%s/image/ranges.png' % root_dir, dpi=48)
-    plt.close(fig)
-
-
-def preprocess(file_path, feature_num=14, shuffle=False, ratio=0.8):
-    data = np.fromfile(file_path, sep=' ')
-    data = data.reshape(data.shape[0] / feature_num, feature_num)
-    maximums, minimums, avgs = data.max(axis=0), data.min(axis=0), data.sum(
-        axis=0) / data.shape[0]
-    feature_range(maximums[:-1], minimums[:-1])
-    for i in xrange(feature_num - 1):
-        data[:, i] = (data[:, i] - avgs[i]) / (maximums[i] - minimums[i])
-    if shuffle:
-        np.random.shuffle(data)
-    offset = int(data.shape[0] * ratio)
-    np.save(train_data, data[:offset])
-    logging.info('saved training data to %s' % train_data)
-    np.save(test_data, data[offset:])
-    logging.info('saved test data to %s' % test_data)
-    save_list()
-
-
-if __name__ == '__main__':
-    parser = argparse.ArgumentParser(
-        description='download boston housing price data set and preprocess the data(normalization and split dataset)'
-    )
-    parser.add_argument(
-        '-r',
-        '--ratio',
-        dest='ratio',
-        default='0.8',
-        help='ratio of data used for training')
-    parser.add_argument(
-        '-s',
-        '--shuffle',
-        dest='shuffle',
-        default='0',
-        choices={'1', '0'},
-        help='shuffle the data before splitting, 1=shuffle, 0=do not shuffle')
-    args = parser.parse_args()
-
-    maybe_download(data_url, raw_data)
-    preprocess(raw_data, shuffle=int(args.shuffle), ratio=float(args.ratio))
diff --git a/fit_a_line/dataprovider.py b/fit_a_line/dataprovider.py
deleted file mode 100644
index f93fe4cafb470c21ac7cf1bd0f34b9fd676856dc..0000000000000000000000000000000000000000
--- a/fit_a_line/dataprovider.py
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from paddle.trainer.PyDataProvider2 import *
-import numpy as np
-
-
-# define data types of input
-@provider(input_types=[dense_vector(13), dense_vector(1)])
-def process(settings, input_file):
-    data = np.load(input_file.strip())
-    for row in data:
-        yield row[:-1].tolist(), row[-1:].tolist()
diff --git a/fit_a_line/predict.py b/fit_a_line/predict.py
deleted file mode 100644
index 0afbf76099435e8c8680cefa92f12afa53c127a4..0000000000000000000000000000000000000000
--- a/fit_a_line/predict.py
+++ /dev/null
@@ -1,79 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-import logging
-import argparse
-import numpy as np
-from py_paddle import swig_paddle, DataProviderConverter
-from paddle.trainer.PyDataProvider2 import *
-from paddle.trainer.config_parser import parse_config
-
-logging.basicConfig(level=logging.INFO)
-
-
-def predict(input_file, model_dir):
-    # prepare PaddlePaddle environment, load models
-    swig_paddle.initPaddle("--use_gpu=0")
-    conf = parse_config('trainer_config.py', 'is_predict=1')
-    network = swig_paddle.GradientMachine.createFromConfigProto(
-        conf.model_config)
-    network.loadParameters(model_dir)
-    slots = [dense_vector(13)]
-    converter = DataProviderConverter(slots)
-
-    data = np.load(input_file)
-    ys = []
-    for row in data:
-        result = network.forwardTest(converter([[row[:-1].tolist()]]))
-        y_true = row[-1:].tolist()[0]
-        y_predict = result[0]['value'][0][0]
-        ys.append([y_true, y_predict])
-
-    ys = np.matrix(ys)
-    avg_err = np.average(np.square((ys[:, 0] - ys[:, 1])))
-    logging.info('MSE of test set is %f' % avg_err)
-
-    # draw a scatter plot
-    import matplotlib
-    matplotlib.use('Agg')
-    import matplotlib.pyplot as plt
-    fig, ax = plt.subplots()
-
-    ax.scatter(ys[:, 0], ys[:, 1])
-    y_range = [ys[:, 0].min(), ys[:, 0].max()]
-    ax.plot(y_range, y_range, 'k--', lw=4)
-    ax.set_xlabel('True ($1000)')
-    ax.set_ylabel('Predicted ($1000)')
-    ax.set_title('Predictions on boston housing price')
-    fig.savefig('image/predictions.png', dpi=60)
-    plt.close(fig)
-
-
-if __name__ == '__main__':
-    parser = argparse.ArgumentParser(
-        description='predict house price and save the result as image.')
-    parser.add_argument(
-        '-m',
-        '--model',
-        dest='model',
-        default='output/pass-00029',
-        help='model path')
-    parser.add_argument(
-        '-t',
-        '--test_data',
-        dest='test_data',
-        default='data/housing.test.npy',
-        help='test data path')
-    args = parser.parse_args()
-
-    predict(input_file=args.test_data, model_dir=args.model)
diff --git a/fit_a_line/train.sh b/fit_a_line/train.sh
deleted file mode 100755
index 7fd01321145fb7d0748945e99096dc7c180eb206..0000000000000000000000000000000000000000
--- a/fit_a_line/train.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/bash
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-set -e
-
-paddle train --config=trainer_config.py --save_dir=./output --num_passes=30
diff --git a/fit_a_line/trainer_config.py b/fit_a_line/trainer_config.py
deleted file mode 100644
index 347cbcef760111cd1b2f10b30d55b04011e16425..0000000000000000000000000000000000000000
--- a/fit_a_line/trainer_config.py
+++ /dev/null
@@ -1,45 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from paddle.trainer_config_helpers import *
-
-is_predict = get_config_arg('is_predict', bool, False)
-
-# 1. read data
-define_py_data_sources2(
-    train_list='data/train.list',
-    test_list='data/test.list',
-    module='dataprovider',
-    obj='process')
-
-# 2. learning algorithm
-settings(batch_size=2)
-
-# 3. Network configuration
-
-x = data_layer(name='x', size=13)
-
-y_predict = fc_layer(
-    input=x,
-    param_attr=ParamAttr(name='w'),
-    size=1,
-    act=LinearActivation(),
-    bias_attr=ParamAttr(name='b'))
-
-if not is_predict:
-    y = data_layer(name='y', size=1)
-    cost = regression_cost(input=y_predict, label=y)
-    outputs(cost)
-else:
-    outputs(y_predict)