Remove tuning level from GPU options

Author: jishminor

README.md

@@ -142,11 +142,9 @@ optimization { execution_accelerators {
     parameters { key: "reduce_fp32_to_fp16" value: "<on/off>" }
     parameters { key: "reduce_fp32_to_bf16" value: "<on/off>" }
     parameters { key: "fast_math_enabled" value: "<on/off>" }
-    parameters { key: "tuning_level" value: "<0-3>" }
   }]
 }}
 ```
-Note that for MALI GPU tuning level the value corresponds to the following: `(0=UseOnly(default) | 1=RapidTuning | 2=NormalTuning | 3=ExhaustiveTuning)`
 
 ### XNNPACK Delegate Optimization Options
 Users also have the ability to specify XNNPACK specific optimizations. 

src/tflite.cc

@@ -352,14 +352,6 @@ ModelState::LoadModel(
                               "Please pass on/off for fast_math_enabled. '") +
                               value_string + "' is requested");
                     }
-                  } else if (param_key == "tuning_level") {
-                    RETURN_IF_ERROR(params.MemberAsString(
-                        param_key.c_str(), &value_string));
-                    RETURN_IF_ERROR(ParseIntValue(value_string, &tuning_level));
-                    armnn::BackendOptions option(
-                        "GpuAcc", {{"TuningLevel", tuning_level}});
-                    armnn_optimizer_options_gpu_.m_ModelOptions.push_back(
-                        option);
                   } else {
                     return TRITONSERVER_ErrorNew(
                         TRITONSERVER_ERROR_INVALID_ARG,