Enable fast_math in CpuFullyConnected

ONCPUML-529
* Add support for passing fast_math for fullyconnected layers via fc_info.
* Add support for passing fast_math to run ACL benchmark graphs.
* Add validation test and accuracy tests (updated fixtures).
Note: abs and rel. tolerance for fast math mode are set based on experimental data.

Signed-off-by: cfRod <crefeda.rodrigues@arm.com>
change-Id: Ib107d6264d3ae5e36555334f39a13e678f8618df
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6521
Reviewed-by: SiCong Li <sicong.li@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/graph/nodes/FullyConnectedLayerNode.h b/arm_compute/graph/nodes/FullyConnectedLayerNode.h
index a7712f4..9ade62b 100644
--- a/arm_compute/graph/nodes/FullyConnectedLayerNode.h
+++ b/arm_compute/graph/nodes/FullyConnectedLayerNode.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020 Arm Limited.
+ * Copyright (c) 2018-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -39,10 +39,22 @@
      * @param[in] num_outputs    Number of neurons in the layer
      * @param[in] out_quant_info (Optional) Output quantization info
      * @param[in] fc_info        (Optional) Additional information about the fully connected layer
+     * @param[in] fast_math_hint (Optional) Fast math hint
      */
     FullyConnectedLayerNode(unsigned int            num_outputs,
                             QuantizationInfo        out_quant_info = QuantizationInfo(),
-                            FullyConnectedLayerInfo fc_info        = FullyConnectedLayerInfo());
+                            FullyConnectedLayerInfo fc_info        = FullyConnectedLayerInfo(),
+                            FastMathHint            fast_math_hint = FastMathHint::Disabled);
+    /** Sets the fast math fast hint
+     *
+     * @param[in] hint Hint to use for fullyconnected layer
+     */
+    void set_fast_math_hint(FastMathHint hint);
+    /** Fast math hint accessor
+     *
+     * @return Fast math hint to be used by the node
+     */
+    FastMathHint fast_math_hint() const;
     /** Sets fused activation
      *
      * @param[in] fused_activation Fused activation to set
@@ -94,6 +106,7 @@
     unsigned int            _num_outputs;
     QuantizationInfo        _out_quant_info;
     FullyConnectedLayerInfo _info;
+    FastMathHint            _fast_math_hint;
 };
 } // namespace graph
 } // namespace arm_compute