Add examples folder and fix README

.ijwb/.bazelproject

@@ -1,7 +1,7 @@
 directories:
   # Add the directories you want added as source here
   # By default, we've added your entire workspace ('.')
-  arrayfire
+  .
 
 # Automatically includes all relevant targets under the 'directories' above
 derive_targets_from_directories: true

README.md

@@ -9,23 +9,24 @@ Currently, the API only supports a subset of functionality of ArrayFire, along w
 The following example demonstrates usage of the API, including autograd.
 
 ```java
-import arrayfire.*;
-import arrayfire.af.*;
+import arrayfire.optimizers.SGD;
+
+import static arrayfire.af.*;
 
 void main() {
     tidy(() -> {
-        var a = params(randu(F32, shape(5)), SGD.create());
+        var a = params(() -> randu(F32, shape(5)), SGD.create());
         var b = randu(F32, shape(5));
         var latestLoss = Float.POSITIVE_INFINITY;
         for (int i = 0; i < 50 || latestLoss >= 1E-10; i++) {
             latestLoss = tidy(() -> {
                 var mul = mul(a, b);
-                var loss = pow(sub(sum(mul), constant(5)), 2);
+                var loss = pow(sub(sum(mul), 5), 2);
                 optimize(loss);
                 return data(loss).get(0);
             });
         }
-        assertEquals(0, latestLoss, 1E-10);
+        System.out.println(latestLoss);
     });
 }
 ```

examples/BUILD

@@ -0,0 +1,6 @@
+java_binary(
+    name = "SimpleSGD",
+    srcs = ["SimpleSGD.java"],
+    main_class = "SimpleSGD",
+    deps = ["//arrayfire"],
+)

examples/SimpleSGD.java

@@ -0,0 +1,20 @@
+import arrayfire.optimizers.SGD;
+
+import static arrayfire.af.*;
+
+void main() {
+    tidy(() -> {
+        var a = params(() -> randu(F32, shape(5)), SGD.create());
+        var b = randu(F32, shape(5));
+        var latestLoss = Float.POSITIVE_INFINITY;
+        for (int i = 0; i < 50 || latestLoss >= 1E-10; i++) {
+            latestLoss = tidy(() -> {
+                var mul = mul(a, b);
+                var loss = pow(sub(sum(mul), 5), 2);
+                optimize(loss);
+                return data(loss).get(0);
+            });
+        }
+        System.out.println(latestLoss);
+    });
+}