Add Alexnet Example

examples/cnn/model/alexnet.py

@@ -0,0 +1,103 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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 singa import autograd
+from singa import module
+
+
+class AlexNet(module.Module):
+
+    def __init__(self, num_classes=10, num_channels=1):
+        super(AlexNet, self).__init__()
+        self.num_classes = num_classes
+        self.input_size = 224
+        self.dimension = 4
+        self.conv1 = autograd.Conv2d(num_channels, 64, 11, stride=4, padding=2)
+        self.conv2 = autograd.Conv2d(64, 192, 5, padding=2)
+        self.conv3 = autograd.Conv2d(192, 384, 3, padding=1)
+        self.conv4 = autograd.Conv2d(384, 256, 3, padding=1)
+        self.conv5 = autograd.Conv2d(256, 256, 3, padding=1)
+        self.linear1 = autograd.Linear(1024, 4096)
+        self.linear2 = autograd.Linear(4096, 4096)
+        self.linear3 = autograd.Linear(4096, num_classes)
+        self.pooling1 = autograd.MaxPool2d(2, 2, padding=0)
+        self.pooling2 = autograd.MaxPool2d(2, 2, padding=0)
+        self.pooling3 = autograd.MaxPool2d(2, 2, padding=0)
+        self.avg_pooling1 = autograd.AvgPool2d(3, 2, padding=0)
+
+    def forward(self, x):
+        y = self.conv1(x)
+        y = autograd.relu(y)
+        y = self.pooling1(y)
+        y = self.conv2(y)
+        y = autograd.relu(y)
+        y = self.pooling2(y)
+        y = self.conv3(y)
+        y = autograd.relu(y)
+        y = self.conv4(y)
+        y = autograd.relu(y)
+        y = self.conv5(y)
+        y = autograd.relu(y)
+        y = self.pooling3(y)
+        y = self.avg_pooling1(y)
+        y = autograd.flatten(y)
+        y = autograd.dropout(y)
+        y = self.linear1(y)
+        y = autograd.relu(y)
+        y = autograd.dropout(y)
+        y = self.linear2(y)
+        y = autograd.relu(y)
+        y = self.linear3(y)
+        return y
+
+    def loss(self, out, ty):
+        return autograd.softmax_cross_entropy(out, ty)
+
+    def optim(self, loss, dist_option, spars):
+        if dist_option == 'fp32':
+            self.optimizer.backward_and_update(loss)
+        elif dist_option == 'fp16':
+            self.optimizer.backward_and_update_half(loss)
+        elif dist_option == 'partialUpdate':
+            self.optimizer.backward_and_partial_update(loss)
+        elif dist_option == 'sparseTopK':
+            self.optimizer.backward_and_sparse_update(loss,
+                                                      topK=True,
+                                                      spars=spars)
+        elif dist_option == 'sparseThreshold':
+            self.optimizer.backward_and_sparse_update(loss,
+                                                      topK=False,
+                                                      spars=spars)
+
+    def set_optimizer(self, optimizer):
+        self.optimizer = optimizer
+
+
+def create_model(pretrained=False, **kwargs):
+    """Constructs a AlexNet model.
+
+    Args:
+        pretrained (bool): If True, returns a model pre-trained
+    """
+    model = AlexNet(**kwargs)
+
+    return model
+
+
+__all__ = ['AlexNet', 'create_model']

examples/cnn/train.py

@@ -133,6 +133,10 @@ def run(global_rank,
         from model import cnn
         model = cnn.create_model(num_channels=num_channels,
                                  num_classes=num_classes)
+    elif model == 'alexnet':
+        from model import alexnet
+        model = alexnet.create_model(num_channels=num_channels,
+                                     num_classes=num_classes)
     elif model == 'mlp':
         import os, sys, inspect
         current = os.path.dirname(
@@ -258,7 +262,7 @@ def run(global_rank,
     parser = argparse.ArgumentParser(
         description='Training using the autograd and graph.')
     parser.add_argument('model',
-                        choices=['resnet', 'xceptionnet', 'cnn', 'mlp'],
+                        choices=['resnet', 'xceptionnet', 'cnn', 'mlp', 'alexnet'],
                         default='cnn')
     parser.add_argument('data',
                         choices=['cifar10', 'cifar100', 'mnist'],