!6602 [MSLITE] Remove cast operator which convert data from fp32 to fp16 in MindSpore models.

Merge pull request !6602 from wangshaocong/lite_convert

mindspore/lite/nnacl/split_parameter.h

@@ -24,8 +24,8 @@ typedef struct SplitParameter {
   OpParameter op_parameter_;
   SplitQuantArg quant_arg_;
   int num_split_;
-  int split_sizes_[20];
-  int strides_[20];
+  int split_sizes_[32];
+  int strides_[32];
   int split_dim_;
   int n_dims_;
   int split_count_;

mindspore/lite/tools/converter/legacy_optimizer/graph/unused_node_remove_pass.cc

@@ -25,15 +25,29 @@
 #include "tools/common/graph_util.h"
 #include "include/errorcode.h"
 #include "mindspore/lite/schema/inner/model_generated.h"
+#include "mindspore/core/ir/dtype/type_id.h"
 
 namespace mindspore {
 namespace lite {
+bool IsUnusedNode(const CNodeT &node) {
+  if (node.primitive->value.type == schema::PrimitiveType_TupleGetItem) {
+    return true;
+  }
+  if (node.primitive->value.type == schema::PrimitiveType_Cast) {
+    auto attr = reinterpret_cast<schema::CastT *>(node.primitive->value.value);
+    if (attr->srcT == kNumberTypeFloat32 && attr->dstT == kNumberTypeFloat16) {
+      return true;
+    }
+  }
+  return false;
+}
+
 STATUS UnusedNodeRemovePass::Run(schema::MetaGraphT *graph) {
   MS_ASSERT(graph != nullptr);
   bool ifChanged = false;
   for (size_t i = 0; i < graph->nodes.size(); i++) {
     auto &node = graph->nodes.at(i);
-    if (node->primitive->value.type == schema::PrimitiveType_TupleGetItem) {
+    if (IsUnusedNode(*node)) {
       ifChanged = true;
       auto status = IsolateOneWayNode(graph, i);
       if (status != RET_OK) {