[GitHub] dwSun commented on a change in pull request #8894: Mobilenet

[GitBox <gi...@apache.org>]

dwSun commented on a change in pull request #8894: Mobilenet
URL: https://github.com/apache/incubator-mxnet/pull/8894#discussion_r155159584
 
 

 ##########
 File path: example/image-classification/symbols/mobilenet.py
 ##########
 @@ -14,48 +14,129 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-
+# -*- coding:utf-8 -*-
 import mxnet as mx
 
-def Conv(data, num_filter=1, kernel=(1, 1), stride=(1, 1), pad=(0, 0), num_group=1, name=None, suffix=''):
-    conv = mx.sym.Convolution(data=data, num_filter=num_filter, kernel=kernel, num_group=num_group, stride=stride, pad=pad, no_bias=True, name='%s%s_conv2d' %(name, suffix))
-    bn = mx.sym.BatchNorm(data=conv, name='%s%s_batchnorm' %(name, suffix), fix_gamma=True)
-    act = mx.sym.Activation(data=bn, act_type='relu', name='%s%s_relu' %(name, suffix))
+__author__ = 'qingzhouzhen'
+modified_date = '17/8/5'
+__modify__ = 'dwSun'
+modified_date = '17/11/30'
+
+'''
+mobilenet
+    Suittable for image with around resolution x resolution, resolution is multiple of 32.
+    
+Reference:
+    MobileNets: Efficient Convolutional Neural Networks for Mobile Vision Applications
+    https://arxiv.org/abs/1704.04861
+'''
+
+alpha_values = [0.25, 0.50, 0.75, 1.0]
+
+
+def Conv(data, num_filter=1, kernel=(1, 1), stride=(1, 1), pad=(0, 0), num_group=1, name='', suffix=''):
+    conv = mx.sym.Convolution(data=data, num_filter=num_filter, kernel=kernel, num_group=num_group, stride=stride, pad=pad, no_bias=True, name='%s%s_conv2d' % (name, suffix))
+    bn = mx.sym.BatchNorm(data=conv, name='%s%s_batchnorm' % (name, suffix), fix_gamma=True)
+    act = mx.sym.Activation(data=bn, act_type='relu', name='%s%s_relu' % (name, suffix))
     return act
 
-def get_symbol(num_classes, **kwargs):
-    data = mx.symbol.Variable(name="data") # 224
-    conv_1 = Conv(data, num_filter=32, kernel=(3, 3), pad=(1, 1), stride=(2, 2), name="conv_1") # 224/112
-    conv_2_dw = Conv(conv_1, num_group=32, num_filter=32, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_2_dw") # 112/112
-    conv_2 = Conv(conv_2_dw, num_filter=64, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_2") # 112/112
-    conv_3_dw = Conv(conv_2, num_group=64, num_filter=64, kernel=(3, 3), pad=(1, 1), stride=(2, 2), name="conv_3_dw") # 112/56
-    conv_3 = Conv(conv_3_dw, num_filter=128, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_3") # 56/56
-    conv_4_dw = Conv(conv_3, num_group=128, num_filter=128, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_4_dw") # 56/56
-    conv_4 = Conv(conv_4_dw, num_filter=128, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_4") # 56/56
-    conv_5_dw = Conv(conv_4, num_group=128, num_filter=128, kernel=(3, 3), pad=(1, 1), stride=(2, 2), name="conv_5_dw") # 56/28
-    conv_5 = Conv(conv_5_dw, num_filter=256, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_5") # 28/28
-    conv_6_dw = Conv(conv_5, num_group=256, num_filter=256, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_6_dw") # 28/28
-    conv_6 = Conv(conv_6_dw, num_filter=256, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_6") # 28/28
-    conv_7_dw = Conv(conv_6, num_group=256, num_filter=256, kernel=(3, 3), pad=(1, 1), stride=(2, 2), name="conv_7_dw") # 28/14
-    conv_7 = Conv(conv_7_dw, num_filter=512, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_7") # 14/14
-
-    conv_8_dw = Conv(conv_7, num_group=512, num_filter=512, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_8_dw") # 14/14
-    conv_8 = Conv(conv_8_dw, num_filter=512, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_8") # 14/14
-    conv_9_dw = Conv(conv_8, num_group=512, num_filter=512, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_9_dw") # 14/14
-    conv_9 = Conv(conv_9_dw, num_filter=512, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_9") # 14/14
-    conv_10_dw = Conv(conv_9, num_group=512, num_filter=512, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_10_dw") # 14/14
-    conv_10 = Conv(conv_10_dw, num_filter=512, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_10") # 14/14
-    conv_11_dw = Conv(conv_10, num_group=512, num_filter=512, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_11_dw") # 14/14
-    conv_11 = Conv(conv_11_dw, num_filter=512, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_11") # 14/14
-    conv_12_dw = Conv(conv_11, num_group=512, num_filter=512, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_12_dw") # 14/14
-    conv_12 = Conv(conv_12_dw, num_filter=512, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_12") # 14/14
-
-    conv_13_dw = Conv(conv_12, num_group=512, num_filter=512, kernel=(3, 3), pad=(1, 1), stride=(2, 2), name="conv_13_dw") # 14/7
-    conv_13 = Conv(conv_13_dw, num_filter=1024, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_13") # 7/7
-    conv_14_dw = Conv(conv_13, num_group=1024, num_filter=1024, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_14_dw") # 7/7
-    conv_14 = Conv(conv_14_dw, num_filter=1024, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_14") # 7/7
-
-    pool = mx.sym.Pooling(data=conv_14, kernel=(7, 7), stride=(1, 1), pool_type="avg", name="global_pool")
+
+def Conv_DPW(data, depth=1, stride=(1, 1), name='', idx=0, suffix=''):
+    conv_dw = Conv(data, num_group=depth, num_filter=depth, kernel=(3, 3), pad=(1, 1), stride=stride, name="conv_%d_dw" % (idx), suffix=suffix)
+    conv = Conv(conv_dw, num_filter=depth * stride[0], kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_%d" % (idx), suffix=suffix)
+    return conv
+
+
+def get_symbol_compact(num_classes, alpha=1, resolution=224, **kwargs):
+    assert alpha in alpha_values, 'Invalid alpha={0}, must be one of {1}'.format(alpha, alpha_values)
+    assert resolution % 32 == 0, 'resolution must be multiple of 32'
+
+    base = int(32 * alpha)
+
+    data = mx.symbol.Variable(name="data")  # 224
+    conv_1 = Conv(data, num_filter=base, kernel=(3, 3), pad=(1, 1), stride=(2, 2), name="conv_1")  # 32*alpha, 224/112
+
+    conv_2_dw = Conv(conv_1, num_group=base, num_filter=base, kernel=(3, 3), pad=(1, 1), stride=(1, 1), name="conv_2_dw")  # 112/112
+    conv_2 = Conv(conv_2_dw, num_filter=base * 2, kernel=(1, 1), pad=(0, 0), stride=(1, 1), name="conv_2")  # 32*alpha, 112/112
+
+    conv_3_dpw = Conv_DPW(conv_2, depth=base * 2, stride=(2, 2), idx=3)  # 64*alpha, 112/56 => 56/56
+    conv_4_dpw = Conv_DPW(conv_3_dpw, depth=base * 4, stride=(1, 1), idx=4)  # 128*alpha, 56/56 =>56/56
+    conv_5_dpw = Conv_DPW(conv_4_dpw, depth=base * 4, stride=(2, 2), idx=5)  # 128*alpha, 56/28 => 28/28
+    conv_6_dpw = Conv_DPW(conv_5_dpw, depth=base * 8, stride=(1, 1), idx=6)  # 256*alpha, 28/28 => 28/28
+    conv_7_dpw = Conv_DPW(conv_6_dpw, depth=base * 8, stride=(2, 2), idx=7)  # 256*alpha, 28/14 => 14/14
+    conv_dpw = conv_7_dpw
+
+    for idx in range(8, 13):
+        conv_dpw = Conv_DPW(conv_dpw, depth=base * 16, stride=(1, 1), idx=idx)  # 512*alpha, 14/14
+
+    conv_12_dpw = conv_dpw
+    conv_13_dpw = Conv_DPW(conv_12_dpw, depth=base * 16, stride=(2, 2), idx=13)  # 512*alpha, 14/7 => 7/7
+    conv_14_dpw = Conv_DPW(conv_13_dpw, depth=base * 32, stride=(1, 1), idx=14)  # 1024*alpha, 7/7 => 7/7
+
+    pool_size = int(resolution / 32)
+    pool = mx.sym.Pooling(data=conv_14_dpw, kernel=(pool_size, pool_size), stride=(1, 1), pool_type="avg", name="global_pool")
+    flatten = mx.sym.Flatten(data=pool, name="flatten")
+    fc = mx.symbol.FullyConnected(data=flatten, num_hidden=num_classes, name='fc')
+    softmax = mx.symbol.SoftmaxOutput(data=fc, name='softmax')
+    return softmax
+
+
+def get_symbol(num_classes, alpha=1, resolution=224, **kwargs):
 
 Review comment:
   This is the function prepared for train_imagenet.py

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