Add loading parameters from saved models. Clean up learning-rate code.

README.rst

@@ -1,9 +1,9 @@
 Neural Enhance
 ==============
 
-`As seen on TV! <https://www.youtube.com/watch?v=LhF_56SxrGk>`_ What if you could increase the resolution of your photos using techniques from CSI laboratories? Thanks to deep learning, it's now possible to train a neural network to zoom in to your images using examples.  You'll get better results by increasing the number of neurons and specializing the training images (e.g. faces).
+`As seen on TV! <https://www.youtube.com/watch?v=LhF_56SxrGk>`_ What if you could increase the resolution of your photos using technology from CSI laboratories? Thanks to deep learning, it's now possible to train a neural network to zoom in to your images using examples.  You'll get better results by increasing the number of neurons and specializing the training images (e.g. faces).
 
-The catch? The neural network is hallucinating details based on its analysis of example images. It's not reconstructing the image exactly as it would have been if it was HD. That's only possible in Holywood — but deep learning as "Creative AI" works and its just as cool!  Here's how you can get started...
+The catch? The neural network is hallucinating details based on its training from example images. It's not reconstructing the image exactly as it would have been if it was HD. That's only possible in Holywood — but deep learning as "Creative AI" works and its just as cool!  Here's how you can get started...
 
 1. `Examples & Usage <#1-examples--usage>`_
 2. `Installation <#2-installation--setup>`_
@@ -152,7 +152,7 @@ It seems your terminal is misconfigured and not compatible with the way Python t
 Q: Is there an application for this? I want to download it!
 -----------------------------------------------------------
 
-There are many online services that provide basic style transfer with neural networks. We run `@DeepForger <https://deepforger.com/>`_, a Twitter & Facebook bot with web interface, that can take your requests too.  It takes time to make forgeries, so there's a queue... be patient!
+A: Not yet.
 
 
 ----

enhance.py

@@ -50,7 +50,7 @@ add_arg('--adversary-weight',   default=1e2, type=float,            help='Weight
 add_arg('--generator-start',    default=0, type=int,                help='Epoch count to start training generator.')
 add_arg('--discriminator-start',default=1, type=int,                help='Epoch count to update the discriminator.')
 add_arg('--adversarial-start',  default=2, type=int,                help='Epoch for generator to use discriminator.')
-add_arg('--device',             default='cpu', type=str,            help='Name of the CPU/GPU to use, for Theano.')
+add_arg('--device',             default='gpu0', type=str,           help='Name of the CPU/GPU to use, for Theano.')
 args = parser.parse_args()
 
 
@@ -132,7 +132,7 @@ class DataLoader(threading.Thread):
                 filename = os.path.join(self.cwd, f)
                 try:
                     if f not in cache:
-                        if len(cache) > 3172:
+                        if len(cache) > 2048:
                             del cache[random.choice(list(cache.keys()))]
 
                         img = scipy.ndimage.imread(filename, mode='RGB')
@@ -200,14 +200,16 @@ class Model(object):
         else:
             self.network['img'] = InputLayer((None, 3, None, None))
             self.network['seed'] = self.network['img']
-        self.setup_generator(self.last_layer())
+
+        config, params = self.load_model()
+        self.setup_generator(self.last_layer(), config)
 
         if args.train:
             concatenated = lasagne.layers.ConcatLayer([self.network['img'], self.network['out']], axis=0)
             self.setup_perceptual(concatenated)
             self.load_perceptual()
             self.setup_discriminator()
-        self.load_generator()
+        self.load_generator(params)
 
         self.compile()
 
@@ -230,7 +232,8 @@ class Model(object):
         self.make_layer(name+'-B', self.last_layer(), units, alpha=1.0)
         return ElemwiseSumLayer([input, self.last_layer()]) if args.generator_residual else self.last_layer()
 
-    def setup_generator(self, input):
+    def setup_generator(self, input, config):
+        for k, v in config.items(): setattr(args, k, v)
         units = args.generator_filters
         self.make_layer('iter.0', input, units, filter_size=(5,5), pad=(2,2))
 
@@ -312,21 +315,25 @@ class Model(object):
     def save_generator(self):
         def cast(p): return p.get_value().astype(np.float16)
         params = {k: [cast(p) for p in l.get_params()] for (k, l) in self.list_generator_layers()}
+        config = {k: getattr(args, k) for k in ['generator_blocks', 'generator_residual', 'generator_filters']}
         filename = args.model % 2**args.scales
-        pickle.dump(params, bz2.open(filename, 'wb'))
+        pickle.dump((config, params), bz2.open(filename, 'wb'))
         print('  - Saved model as `{}` after training.'.format(filename))
 
-    def load_generator(self):
+    def load_model(self):
         filename = args.model % 2**args.scales
-        if not os.path.exists(filename): return
-        params = pickle.load(bz2.open(filename, 'rb'))
+        if not os.path.exists(filename): return {}, {}
+        print('  - Loaded file `{}` with trained model.'.format(filename))
+        return pickle.load(bz2.open(filename, 'rb'))
+
+    def load_generator(self, params):
+        if len(params) == 0: return
         for k, l in self.list_generator_layers():
             assert k in params, "Couldn't find layer `%s` in loaded model.'" 
             assert len(l.get_params()) == len(params[k]), "Mismatch in types of layers."
             for p, v in zip(l.get_params(), params[k]):
                 assert v.shape == p.get_value().shape, "Mismatch in number of parameters."
                 p.set_value(v.astype(np.float32))
-        print('  - Loaded file `{}` with trained model.'.format(filename))
 
     #------------------------------------------------------------------------------------------------------------------
     # Training & Loss Functions
@@ -401,29 +408,31 @@ class NeuralEnhancer(object):
             self.imsave('valid/%03i_pixels.png' % i, scald[i])
             self.imsave('valid/%03i_reprod.png' % i, repro[i])
 
+    def decay_with_restart(self):
+        l_min, l_max, l_mult = 1E-7, 1E-3, 0.5
+        t_cur, t_i, t_mult = 10, 10, 1
+
+        while True:
+            yield l_min + 0.5 * (l_max - l_min) * (1.0 + math.cos(t_cur / t_i * math.pi))
+            t_cur += 1
+
+            if t_cur > t_i:
+                t_cur, t_i = 0, int(t_i * t_mult)
+                l_max = max(l_max * l_mult, 1e-12)
+                l_min = max(l_min * l_mult, 1e-8)
+
     def train(self):
         images = np.zeros((args.batch_size, 3, args.batch_resolution, args.batch_resolution), dtype=np.float32)
-        l_min, l_max, l_mult = 1E-7, 1E-3, 0.2
-        t_cur, t_i, t_mult = 120, 150, 1
-
+        learning_rate = self.decay_with_restart()
         try:
-            i, running, start = 0, None, time.time()
+            running, start = None, time.time()
             for epoch in range(args.epochs):
                 total, stats = None, None
-                for _ in range(args.epoch_size):
-                    i += 1
-                    l_r = l_min + 0.5 * (l_max - l_min) * (1.0 + math.cos(t_cur / t_i * math.pi))
-                    t_cur += 1
-                    l_r = 1E-4
-
-                    if epoch >= args.generator_start: self.model.gen_lr.set_value(l_r)
-                    if epoch >= args.discriminator_start: self.model.disc_lr.set_value(l_r)
-
-                    if t_cur >= t_i:
-                        t_cur, t_i = 0, int(t_i * t_mult)
-                        l_max = max(l_max * l_mult, 1e-11)
-                        l_min = max(l_min * l_mult, 1e-7)
+                l_r = next(learning_rate)
+                if epoch >= args.generator_start: self.model.gen_lr.set_value(l_r)
+                if epoch >= args.discriminator_start: self.model.disc_lr.set_value(l_r)
 
+                for _ in range(args.epoch_size):
                     self.thread.copy(images)
                     output = self.model.fit(images)
                     losses = np.array(output[:3], dtype=np.float32)
@@ -440,12 +449,12 @@ class NeuralEnhancer(object):
                 stats /= args.epoch_size
                 totals, labels = [sum(total)] + list(total), ['total', 'prcpt', 'smthn', 'advrs']
                 gen_info = ['{}{}{}={:4.2e}'.format(ansi.WHITE_B, k, ansi.ENDC, v) for k, v in zip(labels, totals)]
-                print('\rEpoch #{} at {:4.1f}s{}'.format(epoch+1, time.time()-start, '  '*args.epoch_size))
+                print('\rEpoch #{} at {:4.1f}s, lr={:4.2e}    {}'.format(epoch+1, time.time()-start, l_r, ' '*args.epoch_size))
                 print('  - generator {}'.format(' '.join(gen_info)))
 
                 real, fake = stats[:args.batch_size], stats[args.batch_size:]
                 print('  - discriminator', real.mean(), len(np.where(real > 0.5)[0]), fake.mean(), len(np.where(fake < 0.5)[0]))
-                if epoch == args.adversary_start-1:
+                if epoch == args.adversarial_start-1:
                     print('  - adversary mode: generator engaging discriminator.')
                     self.model.adversary_weight.set_value(args.adversary_weight)
                     running = None