Merge branch 'opt/reduce_mem' into 'master'

opt: reduce dl model internal memeory usage.

See merge request ai/esp-dl!185

Author: sun-xiangyu

esp-dl/dl/module/include/dl_module_base.hpp

@@ -46,6 +46,12 @@ class Module {
      */
     virtual ~Module();
 
+#if CONFIG_SPIRAM
+    void *operator new(size_t size) { return heap_caps_malloc(size, MALLOC_CAP_SPIRAM); }
+
+    void operator delete(void *ptr) { heap_caps_free(ptr); }
+#endif
+
     /**
      * @brief Get the tensor index of this module's outputs
      *

esp-dl/dl/tensor/include/dl_tensor_base.hpp

@@ -137,6 +137,12 @@ class TensorBase {
         }
     }
 
+#if CONFIG_SPIRAM
+    void *operator new(size_t size) { return heap_caps_malloc(size, MALLOC_CAP_SPIRAM); }
+
+    void operator delete(void *ptr) { heap_caps_free(ptr); }
+#endif
+
     /**
      * @brief Assign tensor to this tensor
      *