bugfix for offline predict

examples/FasterRCNN/README.md

@@ -29,8 +29,8 @@ To train:
 ```
 ./train.py --load /path/to/ImageNet-ResNet50.npz
 ```
-The code is written for training with __8 GPUs__.
-To run on fewer GPUs, you probably need different hyperparameters for the same performance.
+The code is only for training with 1, 2, 4 or 8 GPUs.
+Otherwise, you probably need different hyperparameters for the same performance.
 
 To predict on an image (and show output in a window):
 ```
@@ -39,6 +39,8 @@ To predict on an image (and show output in a window):
 
 ## Results
 
+Mean Average Precision @IoU=0.50:0.95:
+
 + trainval35k/minival, FASTRCNN_BATCH=256: 33.4. Takes 49h on 8 TitanX.
 + trainval35k/minival, FASTRCNN_BATCH=64: 32.2. Takes 31h on 8 TitanX.
 

examples/FasterRCNN/train.py

@@ -138,8 +138,6 @@ class Model(ModelDesc):
         else:
             opt = tf.train.MomentumOptimizer(lr, 0.9)
         return opt
-        return optimizer.apply_grad_processors(
-            opt, [gradproc.ScaleGradient(('.*/b', 2))])
 
 
 def visualize(model_path, nr_visualize=50, output_dir='output'):

examples/load-alexnet.py

@@ -22,14 +22,8 @@ Usage:
 """
 
 
-class Model(ModelDesc):
-    def _get_inputs(self):
-        return [InputDesc(tf.float32, (None, 227, 227, 3), 'input')]
-
-    def _build_graph(self, inputs):
+def tower_func(image):
     # img: 227x227x3
-        image = inputs[0]
-
     with argscope([Conv2D, FullyConnected], nl=tf.nn.relu):
         l = Conv2D('conv1', image, out_channel=96, kernel_shape=11, stride=4, padding='VALID')
         l = tf.nn.lrn(l, 2, bias=1.0, alpha=2e-5, beta=0.75, name='norm1')
@@ -47,7 +41,6 @@ class Model(ModelDesc):
         # This is just a script to load model, so we ignore the dropout layer
         l = FullyConnected('fc6', l, 4096)
         l = FullyConnected('fc7', l, out_dim=4096)
-        # fc will have activation summary by default. disable this for the output layer
     logits = FullyConnected('fc8', l, out_dim=1000, nl=tf.identity)
     prob = tf.nn.softmax(logits, name='prob')
 
@@ -55,7 +48,8 @@ class Model(ModelDesc):
 def run_test(path, input):
     param_dict = np.load(path, encoding='latin1').item()
     predictor = OfflinePredictor(PredictConfig(
-        model=Model(),
+        inputs_desc=[InputDesc(tf.float32, (None, 227, 227, 3), 'input')],
+        tower_func=tower_func,
         session_init=DictRestore(param_dict),
         input_names=['input'],
         output_names=['prob']
@@ -63,8 +57,7 @@ def run_test(path, input):
 
     im = cv2.imread(input)
     assert im is not None, input
-    im = cv2.resize(im, (227, 227))[:, :, ::-1].reshape(
-        (1, 227, 227, 3)).astype('float32') - 110
+    im = cv2.resize(im, (227, 227))[None, :, :, ::-1].astype('float32') - 110
     outputs = predictor(im)[0]
     prob = outputs[0]
     ret = prob.argsort()[-10:][::-1]

examples/load-vgg16.py

@@ -23,12 +23,7 @@ Usage:
 """
 
 
-class Model(ModelDesc):
-    def _get_inputs(self):
-        return [InputDesc(tf.float32, (None, 224, 224, 3), 'input')]
-
-    def _build_graph(self, inputs):
-        image = inputs[0]
+def tower_func(image):
     with argscope(Conv2D, kernel_shape=3, nl=tf.nn.relu):
         logits = (LinearWrap(image)
                   .Conv2D('conv1_1', 64)
@@ -65,7 +60,8 @@ class Model(ModelDesc):
 def run_test(path, input):
     param_dict = np.load(path, encoding='latin1').item()
     predict_func = OfflinePredictor(PredictConfig(
-        model=Model(),
+        inputs_desc=[InputDesc(tf.float32, (None, 224, 224, 3), 'input')],
+        tower_func=tower_func,
         session_init=DictRestore(param_dict),
         input_names=['input'],
         output_names=['prob']   # prob:0 is the probability distribution

tensorpack/tfutils/tower.py

@@ -66,7 +66,7 @@ class TowerContext(object):
         """
         return self.is_main_training_tower or \
             (self.is_training and len(self._vs_name) > 0) or \
-            (not self.is_training and len(self._vs_name) > 0 and not self._initial_vs_reuse)
+            (not self.is_training and not self._initial_vs_reuse)
 
     @property
     def name(self):