refactor(mge/log): use info as default log level

GitOrigin-RevId: 3b7719a9fe8240bf4cb6646f9500e7393811f589

imperative/python/megengine/logger.py

@@ -12,7 +12,7 @@ import os
 import sys
 
 _all_loggers = []
-_default_level_name = os.getenv("MEGENGINE_LOGGING_LEVEL", "ERROR")
+_default_level_name = os.getenv("MEGENGINE_LOGGING_LEVEL", "INFO")
 _default_level = logging.getLevelName(_default_level_name.upper())
 
 

imperative/src/impl/ops/tensor_manip.cpp

@@ -62,7 +62,7 @@ std::shared_ptr<OpDef> make_from_op_node(cg::OperatorNodeBase* node_) {
     if (node->config().comp_node().size() ||
             node->config().output_dtype().valid() ||
             node->param().axis != opr::GetVarShape::Param::INVALID_AXIS) {
-        mgb_log_warn("weird GetVarShape");
+        mgb_log_debug("weird GetVarShape");
         return OpTrait::find_by_typeinfo(OprAttr::typeinfo())->make_from_op_node(node);
     }
     return GetVarShape::make();