chore: fix build, address comment from previous PR

As I was testing testing, I forgot to fix my test.
Also responded to an unresolved comment from
#39

TensorLib/Dtype.lean

@@ -27,8 +27,21 @@ deriving BEq, Repr, Inhabited
 
 namespace Name
 
+-- Should match the NumPy name of the dtype. We use toString to generate NumPy test code.
 instance : ToString Name where
-  toString x := ((repr x).pretty.splitOn ".").getLast!
+  toString
+  | .bool => "bool"
+  | int8 => "int8"
+  | int16 => "int16"
+  | int32 => "int32"
+  | int64 => "int64"
+  | uint8 => "uint8"
+  | uint16 => "uint16"
+  | uint32 => "uint32"
+  | uint64 => "uint64"
+  | float16 => "float16"
+  | float32 => "float32"
+  | float64 => "float64"
 
 def isOneByte (x : Name) : Bool := match x with
 | bool | int8 | uint8 => true

TensorLib/Test.lean

@@ -20,7 +20,7 @@ private def saveNumpyArray (expr : String) : IO System.FilePath := do
   return file.addExtension "npy"
 
 private def testTensorElementBV (dtype : Dtype) : IO Bool := do
-  let file <- saveNumpyArray s!"np.arange(20, dtype='{dtype.name}').reshape(, 4)"
+  let file <- saveNumpyArray s!"np.arange(20, dtype='{dtype.name}').reshape(5, 4)"
   let npy <- Npy.parseFile file
   let arr <- IO.ofExcept (Tensor.ofNpy npy)
   let _ <- IO.FS.removeFile file