use difference instead of error

docs/driver.rst

@@ -56,11 +56,11 @@ Tolerance for RMS error (Default: 0.001)
 
 .. option::  --atol [double]
 
-Tolerance for elementwise absolute error (Default: 0.001)
+Tolerance for elementwise absolute difference (Default: 0.001)
 
 .. option::  --rtol [double]
 
-Tolerance for elementwise relative error (Default: 0.001)
+Tolerance for elementwise relative difference (Default: 0.001)
 
 .. option::  -i, --per-instruction
 

examples/migraphx/migraphx_driver/README.md

@@ -56,8 +56,8 @@ See below for a comprehensive list of commands and option arguments, as well as
 | --fp16                                   | Quantize for fp16                                         |
 | --int8                                   | Quantize for int8                                         |
 | --rms-tol                                | Tolerance for the RMS error (Default: 0.001)              |
-| --atol                                   | Tolerance for elementwise absolute error (Default: 0.001) |
-| --rtol                                   | Tolerance for elementwise relative error (Default: 0.001) |
+| --atol                                   | Tolerance for elementwise absolute difference (Default: 0.001) |
+| --rtol                                   | Tolerance for elementwise relative difference (Default: 0.001) |
 | --per-instruction \| -i                  | Verify each instruction                                   |
 | --reduce \| -r                           | Reduce program and verify                                 |
 | --iterations \| -n                       | Number of iterations to run for perf report               |

src/driver/main.cpp

@@ -545,10 +545,10 @@ struct verify : command<verify>
         ap(tols.rms_tol, {"--rms-tol"}, ap.help("Tolerance for the RMS error (Default: 0.001)"));
         ap(tols.atol,
            {"--atol"},
-           ap.help("Tolerance for the elementwise absolute error (Default: 0.001)"));
+           ap.help("Tolerance for the elementwise absolute difference (Default: 0.001)"));
         ap(tols.rtol,
            {"--rtol"},
-           ap.help("Tolerance for the elementwise relative error (Default: 0.001)"));
+           ap.help("Tolerance for the elementwise relative difference (Default: 0.001)"));
         ap(per_instruction,
            {"-i", "--per-instruction"},
            ap.help("Verify each instruction"),