fix: empty dim len can be 1 (#949)

examples/onnx/hierarchical_risk/input.json

@@ -0,0 +1 @@
+{"input_data": [[0.38538306951522827, 0.6133589744567871, 0.576287031173706, -0.3345218300819397, 0.13568370044231415, -0.28134018182754517, -0.09186103194952011, -0.4819085896015167, -0.15042705833911896, 0.39111578464508057, -0.043726757168769836, -0.37419062852859497, -0.14557626843452454, -0.23101887106895447, -0.3833008408546448, 0.08098119497299194, 0.3284634053707123, 0.11909070611000061, -0.12443117797374725, 0.15384003520011902, -0.15162622928619385, 0.2291812002658844, 0.3672296404838562, 0.5550448894500732, 0.25582489371299744, 0.4945962131023407, 0.41473111510276794, 0.5560457706451416, -0.04632486402988434, -0.01135106198489666, -0.10522330552339554, 0.20866376161575317, -0.27693474292755127, -0.3848901689052582, -0.23265987634658813, 0.3436954915523529, 0.06377606838941574, -0.08818407356739044, 0.09670328348875046, -0.19627152383327484, -0.3115144968032837, 0.12585119903087616, -0.3302604556083679, -0.2670367956161499, -0.2548302412033081, 0.4729992151260376, 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src/tensor/val.rs

@@ -1342,9 +1342,11 @@ impl<F: PrimeField + TensorType + PartialOrd + std::hash::Hash> ValTensor<F> {
     /// Gets the total number of elements in the tensor
     pub fn len(&self) -> usize {
         match self {
-            ValTensor::Value { dims, .. } => {
+            ValTensor::Value { dims, inner, .. } => {
                 if !dims.is_empty() && (dims != &[0]) {
                     dims.iter().product::<usize>()
+                } else if dims.is_empty() {
+                    inner.inner.len()
                 } else {
                     0
                 }