cherry pick refine core cmake warning and print more info (#18248) (#18267)

* refine core cmake warning and print more info
* fix comments

test=release/1.5

python/CMakeLists.txt

@@ -14,8 +14,12 @@ set(FLUID_CORE_NAME "core")
 if(WITH_AVX AND AVX_FOUND)
   set(FLUID_CORE_NAME "${FLUID_CORE_NAME}_avx")
   if(NOT DEFINED NOAVX_CORE_FILE OR NOAVX_CORE_FILE STREQUAL "")
-    message(WARNING "You are building AVX version without NOAVX core, \
-      and the wheel package may fail on NOAVX machine.")
+    message(STATUS "WARNING: This is just a warning for publishing release.
+      You are building AVX version without NOAVX core.
+      So the wheel package may fail on NOAVX machine.
+      You can add -DFLUID_CORE_NAME=/path/to/your/core_noavx.* in cmake command
+      to get a full wheel package to resolve this warning.
+      While, this version will still work on local machine.")
   endif()
 
   if(NOAVX_CORE_FILE AND NOT EXISTS "${NOAVX_CORE_FILE}")

python/paddle/fluid/__init__.py

@@ -14,6 +14,23 @@
 
 from __future__ import print_function
 import os
+import sys
+
+# The legacy core need to be removed before "import core",
+# in case of users installing paddlepadde without -U option
+core_suffix = 'so'
+if os.name == 'nt':
+    core_suffix = 'pyd'
+
+legacy_core = os.path.abspath(os.path.dirname(
+    __file__)) + os.sep + 'core.' + core_suffix
+if os.path.exists(legacy_core):
+    sys.stderr.write('Deleting legacy file ' + legacy_core + '\n')
+    try:
+        os.remove(legacy_core)
+    except Exception as e:
+        raise e
+
 # import all class inside framework into fluid module
 from . import framework
 from .framework import *

python/paddle/fluid/core.py

@@ -18,10 +18,23 @@ import sys
 import os
 from cpuinfo import get_cpu_info
 
+core_suffix = 'so'
+if os.name == 'nt':
+    core_suffix = 'pyd'
+
+has_avx_core = False
+has_noavx_core = False
+
+current_path = os.path.abspath(os.path.dirname(__file__))
+if os.path.exists(current_path + os.sep + 'core_avx.' + core_suffix):
+    has_avx_core = True
+
+if os.path.exists(current_path + os.sep + 'core_noavx.' + core_suffix):
+    has_noavx_core = True
+
 try:
     if os.name == 'nt':
-        third_lib_path = os.path.abspath(os.path.dirname(
-            __file__)) + os.sep + '..' + os.sep + 'libs'
+        third_lib_path = current_path + os.sep + '..' + os.sep + 'libs'
         os.environ['path'] += ';' + third_lib_path
         sys.path.append(third_lib_path)
 
@@ -59,12 +72,17 @@ if 'avx' in get_cpu_info()['flags']:
         from .core_avx import _set_fuse_parameter_memory_size
         from .core_avx import _is_dygraph_debug_enabled
         from .core_avx import _dygraph_debug_level
-    except ImportError:
-        sys.stderr.write(
-            'WARNING: Can not import avx core. You may not build with AVX, '
-            'but AVX is supported on local machine, you could build paddle '
-            'WITH_AVX=ON to get better performance. ')
-        load_noavx = True
+    except ImportError as e:
+        if has_avx_core:
+            raise e
+        else:
+            sys.stderr.write(
+                'WARNING: Do not have avx core. You may not build with AVX, '
+                'but AVX is supported on local machine.\n You could build paddle '
+                'WITH_AVX=ON to get better performance.\n')
+            load_noavx = True
+    except Exception as e:
+        raise e
 else:
     load_noavx = True
 
@@ -82,7 +100,11 @@ if load_noavx:
         from .core_noavx import _set_fuse_parameter_memory_size
         from .core_noavx import _is_dygraph_debug_enabled
         from .core_noavx import _dygraph_debug_level
-    except ImportError as error:
-        sys.exit("Error: Can not load core_noavx.* ." +
-                 error.__class__.__name__)
-        load_noavx = True
+    except ImportError as e:
+        if has_noavx_core:
+            sys.stderr.write(
+                'Error: Can not import noavx core while this file exists ' +
+                current_path + os.sep + 'core_noavx.' + core_suffix + '\n')
+        raise e
+    except Exception as e:
+        raise e