add brief introduction about distillation demo

demo/distillation/distillation_demo.py

@@ -13,9 +13,8 @@ import numpy as np
 import paddle.fluid as fluid
 sys.path.append(sys.path[0] + "/../")
 import models
-import imagenet_reader as reader
 from utility import add_arguments, print_arguments, _download, _decompress
-from single_distiller import merge, l2_loss, soft_label_loss, fsp_loss
+from paddleslim.dist import merge, l2_loss, soft_label_loss, fsp_loss
 
 logging.basicConfig(format='%(asctime)s-%(levelname)s: %(message)s')
 _logger = logging.getLogger(__name__)
@@ -33,7 +32,7 @@ add_arg('lr_strategy',      str,  "piecewise_decay",   "The learning rate decay
 add_arg('l2_decay',         float,  3e-5,               "The l2_decay parameter.")
 add_arg('momentum_rate',    float,  0.9,               "The value of momentum_rate.")
 add_arg('num_epochs',       int,  120,               "The number of total epochs.")
-add_arg('data',             str, "mnist",                 "Which data to use. 'mnist' or 'imagenet'")
+add_arg('data',             str, "cifar10",                 "Which data to use. 'cifar10' or 'imagenet'")
 add_arg('log_period',       int, 20,                 "Log period in batches.")
 add_arg('model',            str,  "MobileNet",          "Set the network to use.")
 add_arg('pretrained_model', str,  None,                "Whether to use pretrained model.")
@@ -76,7 +75,7 @@ def create_optimizer(args):
 
 
 def compress(args):
-    if args.data == "mnist":
+    if args.data == "cifar10":
         import paddle.dataset.cifar as reader
         train_reader = reader.train10()
         val_reader = reader.test10()
@@ -176,8 +175,8 @@ def compress(args):
         place)
 
     with fluid.program_guard(main, s_startup):
-        l2_loss_v = l2_loss("teacher_fc_0.tmp_0", "fc_0.tmp_0", main)
-        loss = avg_cost + l2_loss_v
+        l2_loss = l2_loss("teacher_fc_0.tmp_0", "fc_0.tmp_0", main)
+        loss = avg_cost + l2_loss
         opt = create_optimizer(args)
         opt.minimize(loss)
     exe.run(s_startup)
@@ -192,7 +191,7 @@ def compress(args):
                 parallel_main,
                 feed=data,
                 fetch_list=[
-                    loss.name, avg_cost.name, l2_loss_v.name
+                    loss.name, avg_cost.name, l2_loss.name
                 ])
             if step_id % args.log_period == 0:
                 _logger.info(

doc/demo_guide.md

 
 ## [蒸馏](../demo/distillation/distillation_demo.py)
 
+蒸馏demo默认使用ResNet50作为teacher网络，MobileNet作为student网络，此外还支持将teacher和student换成[models目录](../demo/models)支持的任意模型
+
+demo中对teahcer模型和student模型的一层特征图添加了l2_loss的蒸馏损失函数，使用时也可根据需要选择fsp_loss, soft_label_loss以及自定义的loss函数
+
+训练默认使用的是cifar10数据集，piecewise_decay学习率衰减策略，momentum优化器进行120轮蒸馏训练。使用者也可以简单地用args参数切换为使用ImageNet数据集，cosine_decay学习率衰减策略等其他训练配置
+