Fix for ambiguous overload in kernels/portable/cpu/op_gelu.cpp

This fix a error you get when using newer (more strict) compiler version

Signed-off-by: Zingo Andersen <[email protected]>
Change-Id: I2f64949e35ecd2cb3604c1579ea38a5d9d972118

Author: zingo

kernels/portable/cpu/op_gelu.cpp

@@ -51,7 +51,7 @@ Tensor& gelu_out(
 
             const CTYPE x_cubed = x * x * x;
             const CTYPE inner = kBeta * (x + kKappa * x_cubed);
-            const CTYPE ret = 0.5 * x * (1 + std::tanh(inner));
+            const CTYPE ret = 0.5 * x * (1.0 + std::tanh(inner));
 
             return ret;
           },