Fix AdamOptimizer and Scale sample code Bug (#21478)

* fix adam sample code bug test=document_fix

* fix sample code bug in scale test=document_fix

python/paddle/fluid/layers/nn.py

@@ -10199,7 +10199,7 @@ def scale(x, scale=1.0, bias=0.0, bias_after_scale=True, act=None, name=None):
             import numpy as np
 
             inputs = fluid.layers.data(name="x", shape=[2, 3], dtype='float32')
-            scale = fluid.layers.data(name="scale", shape=[1], dtype='float32'
+            scale = fluid.layers.data(name="scale", shape=[1], dtype='float32',
                                       append_batch_size=False)
             output = fluid.layers.scale(inputs, scale = scale, bias = 1.0)
 

python/paddle/fluid/optimizer.py

@@ -1549,7 +1549,7 @@ class AdamOptimizer(Optimizer):
                 avg_cost = fluid.layers.mean(cost)
 
                 # define beta decay variable
-                def get_decayed_betas(beta1_init, beta2_init, decay_steps, decay_rate)
+                def get_decayed_betas(beta1_init, beta2_init, decay_steps, decay_rate):
                     global_step = lr_scheduler._decay_step_counter()
 
                     beta1 = fluid.layers.create_global_var(
@@ -1578,7 +1578,7 @@ class AdamOptimizer(Optimizer):
                 beta1, beta2 = get_decayed_betas(0.9, 0.99, 1e5, 0.9)
                 adam_optimizer = fluid.optimizer.AdamOptimizer(
                                                     learning_rate=0.01,
-                                                    beta1=beta1
+                                                    beta1=beta1,
                                                     beta2=beta2)
                 adam_optimizer.minimize(avg_cost)