chore: document the builder functions

wonnx/src/builder.rs

@@ -26,11 +26,13 @@ impl<'model> From<&TensorRef<'model>> for Input<'model> {
 }
 
 impl<'model> TensorRef<'model> {
+    /// Element-wise addition of two tensors (ONNX Add operator)
     pub fn add(&self, rhs: &Self) -> Self {
         assert_eq!(self.output_shape, rhs.output_shape);
         self.binary_op(rhs, "Add", self.output_shape.clone())
     }
 
+    /// Element-wise negation of this tensor (ONNX Neg operator)
     pub fn neg(&self) -> Self {
         self.unary_mapping_op("Neg")
     }
@@ -54,6 +56,7 @@ impl<'model> TensorRef<'model> {
         }
     }
 
+    /// Convolution (ONNX Conv operator)
     pub fn conv(&self, weights: &Self, kernel_shape: &[usize], output_dims: &[usize]) -> Self {
         let output_shape = Shape::from(self.output_shape.data_type, output_dims);
         let mut op = OperatorDefinition::new(
@@ -95,6 +98,7 @@ impl<'model> TensorRef<'model> {
     }
 }
 
+/// Create a tensor reference representing input supplied at inference time.
 pub fn input<'model, S: ToString>(
     name: S,
     scalar_type: ScalarType,
@@ -114,6 +118,7 @@ pub fn input<'model, S: ToString>(
     }
 }
 
+/// Create a tensor reference containing static data (included in the model).
 pub fn tensor<'model, S: ToString>(
     name: S,
     dims: &[usize],