README.md in tensorflow-0.1.1 vs README.md in tensorflow-0.1.2

@@ -37,10 +37,17 @@
 ```ruby
 v = Tf::Variable.new(0.0)
 w = v + 1
 ```
 
+## Math
+
+```ruby
+Tf::Math.abs(-2)
+Tf::Math.sqrt(4)
+```
+
 ## FizzBuzz
 
 ```ruby
 def fizzbuzz(max_num)
   max_num.times do |i|
@@ -58,14 +65,29 @@
 end
 
 fizzbuzz(15)
 ```
 
-## Keras
+## Data::Dataset
 
-Coming soon
+```ruby
+# load
+train_dataset = Tf::Data::Dataset.from_tensor_slices([train_examples, train_labels])
+test_dataset = Tf::Data::Dataset.from_tensor_slices([test_examples, test_labels])
 
+# shuffle and batch
+train_dataset = train_dataset.shuffle(100).batch(32)
+test_dataset = test_dataset.batch(32)
+
+# iterate
+train_dataset.each do |examples, labels|
+  # ...
+end
+```
+
+## Keras [coming soon]
+
 ```ruby
 mnist = Tf::Keras::Datasets::MNIST
 (x_train, y_train), (x_test, y_test) = mnist.load_data
 x_train = x_train / 255.0
 x_test = x_test / 255.0
@@ -112,5 +134,14 @@
 
 - [Report bugs](https://github.com/ankane/tensorflow/issues)
 - Fix bugs and [submit pull requests](https://github.com/ankane/tensorflow/pulls)
 - Write, clarify, or fix documentation
 - Suggest or add new features
+
+To get started with development and testing:
+
+```sh
+git clone https://github.com/ankane/tensorflow.git
+cd tensorflow
+bundle install
+rake test
+```