Update gaudi_config.json

roberta-large config autocast enabled is not working and gives nan value in loss. For optimum-habana 1.6.1 roberta-large config should be based on habana_mixed_precision.

gaudi_config.json

@@ -1,5 +1,28 @@
 {
-  "use_torch_autocast": true,
-  "use_fused_adam": true,
-  "use_fused_clip_norm": true
-}
+ "use_habana_mixed_precision": true,
+ "hmp_is_verbose": false,
+ "use_fused_adam": true,
+ "use_fused_clip_norm": true,
+ "hmp_bf16_ops": [
+   "add",
+   "addmm",
+   "bmm",
+   "div",
+   "dropout",
+   "gelu",
+   "iadd",
+   "linear",
+   "layer_norm",
+   "matmul",
+   "mm",
+   "rsub",
+   "softmax",
+   "truediv"
+ ],
+ "hmp_fp32_ops": [
+   "cross_entropy",
+   "embedding",
+   "nll_loss",
+   "log_softmax"
+ ]
+}