raise RuntimeError for int base pow (#8852)

current implementation is not precise and blocking other simplification change

test/external/external_test_onnx_backend.py

@@ -95,6 +95,10 @@ backend_test.exclude('test_dequantizelinear_e5m2_cpu')
 # we don't support indexes
 backend_test.exclude('test_nonzero_*')
 
+# no support for int pow
+backend_test.exclude('test_pow_types_int32_int32_cpu')
+backend_test.exclude('test_pow_types_int64_int64_cpu')
+
 # no support for fmod
 backend_test.exclude('test_mod_int64_fmod_cpu')
 backend_test.exclude('test_mod_mixed_sign_float16_cpu')

test/test_ops.py

@@ -619,6 +619,7 @@ class TestOps(unittest.TestCase):
     # TODO: fix backward, should be nan
     helper_test_op(None, lambda x: (-2)**x, vals=[[-2.,-1,0,1,2,3]], forward_only=True)
 
+  @unittest.skip("not supported")
   def test_pow_int(self):
     def _test(base, exponent): helper_test_op(None, lambda x,y: x**y, vals=[base, exponent], forward_only=True)
 

tinygrad/tensor.py

@@ -3310,6 +3310,8 @@ class Tensor(SimpleMathTrait):
     if not isinstance(x, Tensor) and reverse and x > 0: return self.mul(math.log(x)).exp()
 
     base, exponent = self._broadcasted(x, reverse=reverse)
+    # TODO: int pow
+    if not base.is_floating_point(): raise RuntimeError("base needs to be float")
     # start with b ** e = exp(e * log(b))
     ret = base.abs().log().mul(exponent).exp()
     # correct sign of negative base with odd exponent (cos has a period of 2pi so we use it here to get the oddness of the exponent)