There is a cyclic import in dmprof

tools/deep_memory_profiler/lib/dump.py

Index: tools/deep_memory_profiler/lib/dump.py
diff --git a/tools/deep_memory_profiler/lib/dump.py b/tools/deep_memory_profiler/lib/dump.py
index 798763a1f529691bf86a91a6a9cd3aac4ffbd1b2..64a86f80b20eea0365e7e1ccc6557fe201570518 100644
--- a/tools/deep_memory_profiler/lib/dump.py
+++ b/tools/deep_memory_profiler/lib/dump.py
@@ -3,8 +3,6 @@
 # found in the LICENSE file.
 
 import logging
-import os
-
 
 LOGGER = logging.getLogger('dmprof')
 
@@ -71,35 +69,4 @@ class Dump(object):
     Raises:
         ParsingException for invalid heap profile dumps.
     """
-    from lib.deep_dump import DeepDump
-    dump = DeepDump(path, os.stat(path).st_mtime)
-    with open(path, 'r') as f:
-      dump.load_file(f, log_header)
-    return dump
-
-
-class DumpList(object):
-  """Represents a sequence of heap profile dumps.
-
-  Individual dumps are loaded into memory lazily as the sequence is accessed,
-  either while being iterated through or randomly accessed.  Loaded dumps are
-  not cached, meaning a newly loaded Dump object is returned every time an
-  element in the list is accessed.
-  """
-
-  def __init__(self, dump_path_list):
-    self._dump_path_list = dump_path_list
-
-  @staticmethod
-  def load(path_list):
-    return DumpList(path_list)
-
-  def __len__(self):
-    return len(self._dump_path_list)
-
-  def __iter__(self):
-    for dump in self._dump_path_list:
-      yield Dump.load(dump)
-
-  def __getitem__(self, index):
-    return Dump.load(self._dump_path_list[index])
+    raise NotImplementedError