Add resize tensor function

src/value.rs

@@ -192,6 +192,18 @@ impl<T: OrtType> Tensor<T> {
     pub fn value_mut(&mut self) -> &mut Value {
         &mut self.val
     }
+
+    // must be owned or will panic, don't give it negative dims
+    pub fn resize(&mut self, dims: Vec<i64>)
+        where T: Clone + Default
+    {
+        let len = dims.iter().product::<i64>();
+        let owned = self.owned.as_mut().expect("Tensor::resize not owned");
+        owned.resize(len as usize, T::default());
+        unsafe {
+            self.value_mut().shape_and_type().set_dims(&dims);
+        }
+    }
 }
 
 impl<T> std::borrow::Borrow<[T]> for Tensor<T> {