scripts/training.py: Use keras.backend.image_data_format() to support newer keras version.

If you want to support newer Keras, then according to
[keras-team/keras#12649](keras-team/keras#12649)
the image_dim_ordering method has to be renamed to keras.backend.image_data_format()

This is the way to use the new Keras API:

setting:
K.set_image_dim_ordering('tf') --> K.set_image_data_format('channels_last')
K.set_image_dim_ordering('th') --> K.set_image_data_format('channels_first')

checking:
K.image_dim_ordering() == 'tf' --> K.image_data_format() == 'channels_last'
K.image_dim_ordering() == 'th' --> K.image_data_format() == 'channels_first'

Signed-off-by: Elvis Dowson <elvis.dowson@gmail.com>

Author: Elvis Dowson

scripts/training.py

@@ -150,7 +150,7 @@ def getResnetModel(d):
 	activation    = d.act
 	advanced_act  = d.aact
 	drop_prob     = d.dropout
-	inputShape    = (3, 32, 32) if K.image_dim_ordering() == "th" else (32, 32, 3)
+	inputShape    = (3, 32, 32) if K.image_data_format() == "channels_first" else (32, 32, 3)
 	channelAxis   = 1 if K.image_data_format() == 'channels_first' else -1
 	filsize       = (3, 3)
 	convArgs      = {