go: Add an example.

Add an example (that will appear in Go doc) for a real use of the Go TensorFlow
APIs - using a pre-defined image recognition model for inference.

While at it a couple of minor tweaks:
- NewSession now accepts 'nil' for options as the documentation says it does
- Convenience accessors for the Outputs of an Operation
- Ability to extract (possibly partial) shapes from an Output

Another step towards #10
Change: 134560938

1 files changed, 3 insertions, 0 deletions

diff --git a/tensorflow/go/session.go b/tensorflow/go/session.go
index 41b6ad4683..83dbbd8c04 100644
--- a/tensorflow/go/session.go
+++ b/tensorflow/go/session.go
@@ -180,6 +180,9 @@ type SessionOptions struct {
 // deallocate by calling C.TF_DeleteSessionOptions().
 func (o *SessionOptions) c() *C.TF_SessionOptions {
 	opt := C.TF_NewSessionOptions()
+	if o == nil {
+		return opt
+	}
 	t := C.CString(o.Target)
 	C.TF_SetTarget(opt, t)
 	C.free(unsafe.Pointer(t))