Reimplement Conv2DTranspose to avoid Keras bugs.

tensorpack/models/_old_batch_norm.py

@@ -98,7 +98,7 @@ def BatchNorm(inputs, training=None, momentum=0.9, epsilon=1e-5,
                 don't want to fine tune the EMA. EMA will not be updated in
                 this case.
     """
-    data_format = get_data_format(data_format, tfmode=False)
+    data_format = get_data_format(data_format, keras_mode=False)
     shape = inputs.get_shape().as_list()
     ndims = len(shape)
     assert ndims in [2, 4]

tensorpack/models/batch_norm.py

@@ -147,7 +147,7 @@ def BatchNorm(inputs, axis=None, training=None, momentum=0.9, epsilon=1e-5,
           this case.
     """
     # parse shapes
-    data_format = get_data_format(data_format, tfmode=False)
+    data_format = get_data_format(data_format, keras_mode=False)
     shape = inputs.get_shape().as_list()
     ndims = len(shape)
     assert ndims in [2, 4], ndims

tensorpack/models/conv2d.py

@@ -80,7 +80,7 @@ def Conv2D(
 
     else:
         # group conv implementation
-        data_format = get_data_format(data_format, tfmode=False)
+        data_format = get_data_format(data_format, keras_mode=False)
         in_shape = inputs.get_shape().as_list()
         channel_axis = 3 if data_format == 'NHWC' else 1
         in_channel = in_shape[channel_axis]
@@ -163,6 +163,7 @@ def Conv2DTranspose(
         else:
             kernel_initializer = tf.keras.initializers.VarianceScaling(2.0, distribution='untruncated_normal')
 
+    if get_tf_version_tuple() <= (1, 12):
         with rename_get_variable({'kernel': 'W', 'bias': 'b'}):
             layer = tf.layers.Conv2DTranspose(
                 filters,
@@ -180,10 +181,53 @@ def Conv2DTranspose(
                 _reuse=tf.get_variable_scope().reuse)
             ret = layer.apply(inputs, scope=tf.get_variable_scope())
             ret = tf.identity(ret, name='output')
-
         ret.variables = VariableHolder(W=layer.kernel)
         if use_bias:
             ret.variables.b = layer.bias
+    else:
+        # Our own implementation, to avoid Keras bugs. https://github.com/tensorflow/tensorflow/issues/25946
+        assert kernel_regularizer is None and bias_regularizer is None and activity_regularizer is None, \
+            "Unsupported arguments due to bug in TensorFlow 1.13"
+        data_format = get_data_format(data_format, keras_mode=False)
+        shape_dyn = tf.shape(inputs)
+        strides2d = shape2d(strides)
+        channels_in = inputs.shape[1 if data_format == 'NCHW' else 3]
+        if data_format == 'NCHW':
+            channels_in = inputs.shape[1]
+            out_shape_dyn = tf.stack(
+                [shape_dyn[0], filters,
+                 shape_dyn[2] * strides2d[0],
+                 shape_dyn[3] * strides2d[1]])
+            out_shape3_sta = [filters,
+                              None if inputs.shape[2] is None else inputs.shape[2] * strides2d[0],
+                              None if inputs.shape[3] is None else inputs.shape[3] * strides2d[1]]
+        else:
+            channels_in = inputs.shape[-1]
+            out_shape_dyn = tf.stack(
+                [shape_dyn[0],
+                 shape_dyn[1] * strides2d[0],
+                 shape_dyn[2] * strides2d[1],
+                 channels_in])
+            out_shape3_sta = [None if inputs.shape[1] is None else inputs.shape[1] * strides2d[0],
+                              None if inputs.shape[2] is None else inputs.shape[2] * strides2d[1],
+                              filters]
+
+        kernel_shape = shape2d(kernel_size)
+        W = tf.get_variable('W', kernel_shape + [filters, channels_in], initializer=kernel_initializer)
+        if use_bias:
+            b = tf.get_variable('b', [filters], initializer=bias_initializer)
+        conv = tf.nn.conv2d_transpose(
+            inputs, W, out_shape_dyn,
+            shape4d(strides, data_format=data_format),
+            padding=padding.upper(),
+            data_format=data_format)
+        conv.set_shape(tf.TensorShape([None] + out_shape3_sta))
+        ret = activation(tf.nn.bias_add(conv, b, data_format=data_format) if use_bias else conv, name='output')
+
+        ret.variables = VariableHolder(W=W)
+        if use_bias:
+            ret.variables.b = b
+
     return ret
 
 

tensorpack/models/layer_norm.py

@@ -24,7 +24,7 @@ def LayerNorm(
         epsilon (float): epsilon to avoid divide-by-zero.
         use_scale, use_bias (bool): whether to use the extra affine transformation or not.
     """
-    data_format = get_data_format(data_format, tfmode=False)
+    data_format = get_data_format(data_format, keras_mode=False)
     shape = x.get_shape().as_list()
     ndims = len(shape)
     assert ndims in [2, 4]
@@ -75,7 +75,7 @@ def InstanceNorm(x, epsilon=1e-5, use_affine=True, gamma_init=None, data_format=
         epsilon (float): avoid divide-by-zero
         use_affine (bool): whether to apply learnable affine transformation
     """
-    data_format = get_data_format(data_format, tfmode=False)
+    data_format = get_data_format(data_format, keras_mode=False)
     shape = x.get_shape().as_list()
     assert len(shape) == 4, "Input of InstanceNorm has to be 4D!"
 

tensorpack/models/pool.py

@@ -102,7 +102,7 @@ def FixedUnPooling(x, shape, unpool_mat=None, data_format='channels_last'):
     Returns:
         tf.Tensor: a 4D image tensor.
     """
-    data_format = get_data_format(data_format, tfmode=False)
+    data_format = get_data_format(data_format, keras_mode=False)
     shape = shape2d(shape)
 
     output_shape = StaticDynamicShape(x)

tensorpack/models/tflayer.py

@@ -15,7 +15,7 @@ __all__ = []
 def map_common_tfargs(kwargs):
     df = kwargs.pop('data_format', None)
     if df is not None:
-        df = get_data_format(df, tfmode=True)
+        df = get_data_format(df, keras_mode=True)
         kwargs['data_format'] = df
 
     old_nl = kwargs.pop('nl', None)

tensorpack/train/trainers.py

@@ -340,7 +340,7 @@ class HorovodTrainer(SingleCostTrainer):
            for Horovod installation and in the MPI command line.
            See Horovod docs for details.
 
-        2. Due to a TF bug, you must not initialize CUDA context before the trainer starts training.
+        2. Due to a TF bug (#8136), you must not initialize CUDA context before the trainer starts training.
            Therefore TF functions like `is_gpu_available()` or `list_local_devices()`
            must be avoided.
 

tensorpack/utils/argtools.py

@@ -104,8 +104,8 @@ def shape2d(a):
     raise RuntimeError("Illegal shape: {}".format(a))
 
 
-def get_data_format(data_format, tfmode=True):
-    if tfmode:
+def get_data_format(data_format, keras_mode=True):
+    if keras_mode:
         dic = {'NCHW': 'channels_first', 'NHWC': 'channels_last'}
     else:
         dic = {'channels_first': 'NCHW', 'channels_last': 'NHWC'}
@@ -115,7 +115,7 @@ def get_data_format(data_format, tfmode=True):
     return ret
 
 
-def shape4d(a, data_format='channels_last'):
+def shape4d(a, data_format='NHWC'):
     """
     Ensuer a 4D shape, to use with 4D symbolic functions.
 
@@ -127,7 +127,7 @@ def shape4d(a, data_format='channels_last'):
             or ``[1, 1, a, a]`` depending on data_format.
     """
     s2d = shape2d(a)
-    if get_data_format(data_format) == 'channels_last':
+    if get_data_format(data_format, False) == 'NHWC':
         return [1] + s2d + [1]
     else:
         return [1, 1] + s2d