Adding 64 bit tensor data types (#54)

Co-authored-by: Stuart Schaefer <[email protected]>

ml.md

@@ -26,9 +26,11 @@ Then, the user passes <em>tensor</em> inputs to the <em>graph</em>, computes the
 <ul>
 <li><a name="tensor_type.fp16"><code>FP16</code></a></li>
 <li><a name="tensor_type.fp32"><code>FP32</code></a></li>
+<li><a name="tensor_type.fp64"><code>FP64</code></a></li>
 <li><a name="tensor_type.bf16"><code>BF16</code></a></li>
 <li><a name="tensor_type.u8"><code>U8</code></a></li>
 <li><a name="tensor_type.i32"><code>I32</code></a></li>
+<li><a name="tensor_type.i64"><code>I64</code></a></li>
 </ul>
 <h4><a name="tensor_dimensions"><code>type tensor-dimensions</code></a></h4>
 <p><a href="#tensor_dimensions"><a href="#tensor_dimensions"><code>tensor-dimensions</code></a></a></p>

wasi-nn.witx

@@ -20,8 +20,10 @@
  (enum (@witx tag u8)
  $f16
  $f32
+ $f64
  $u8
  $i32
+ $i64
  )
 )
 (typename $tensor_data (list u8))

wit/wasi-nn.wit

@@ -27,9 +27,11 @@ interface tensor {
  enum tensor-type {
  FP16,
  FP32,
+ FP64,
  BF16,
  U8,
- I32
+ I32,
+ I64
  }
 
  /// The tensor data.