Drop unused imports from caffe2/python (pytorch#49980)

Summary:
Pull Request resolved: pytorch#49980

From
```
./python/libcst/libcst codemod remove_unused_imports.RemoveUnusedImportsWithGlean --no-format caffe2/
```

Test Plan: Standard sandcastle tests

Reviewed By: xush6528

Differential Revision: D25727359

fbshipit-source-id: c4f60005b10546423dc093d31d46deb418352286

Author: r-barnes

caffe2/python/_import_c_extension.py

@@ -5,16 +5,6 @@
 import sys
 from caffe2.python import extension_loader
 
-# NOTE: we have to import python protobuf here **before** we load cpp extension.
-# Otherwise it breaks under certain build conditions if cpp implementation of
-# protobuf is used. Presumably there's some registry in protobuf library and
-# python side has to initialize the dictionary first, before static
-# initialization in python extension does so. Otherwise, duplicated protobuf
-# descriptors will be created and it can lead to obscure errors like
-#   "Parameter to MergeFrom() must be instance of same class:
-#    expected caffe2.NetDef got caffe2.NetDef."
-import caffe2.proto
-
 # We will first try to load the gpu-enabled caffe2. If it fails, we will then
 # attempt to load the cpu version. The cpu backend is the minimum required, so
 # if that still fails, we will exit loud.

caffe2/python/benchmarks/sparse_lengths_sum_nbit_benchmark.py

@@ -5,7 +5,7 @@
 
 import hypothesis.strategies as st
 import numpy as np
-from caffe2.python import core, dyndep, workspace
+from caffe2.python import core, workspace
 
 
 def benchmark_sparse_lengths_sum(

caffe2/python/convert.py

@@ -5,6 +5,3 @@
 
 
 
-from caffe2.proto import caffe2_pb2, torch_pb2
-
-import caffe2.python._import_c_extension as C

caffe2/python/convert_test.py

@@ -3,10 +3,8 @@
 
 
 
-from caffe2.python import convert, workspace
-from caffe2.proto import caffe2_pb2, torch_pb2
+from caffe2.python import workspace
 import unittest
-import numpy as np
 
 class TestOperator(unittest.TestCase):
     def setUp(self):

caffe2/python/core_gradients_test.py

@@ -3,7 +3,6 @@
 
 
 
-from future.utils import bytes_to_native_str
 from hypothesis import given, settings
 import hypothesis.strategies as st
 import unittest

caffe2/python/dataio_test.py

@@ -6,7 +6,6 @@
 from caffe2.python.dataio import (
     CompositeReader,
     CompositeReaderBuilder,
-    Reader,
     ReaderBuilder,
     ReaderWithDelay,
     ReaderWithLimit,
@@ -29,7 +28,6 @@
 import shutil
 import unittest
 import tempfile
-import time
 
 
 def make_source_dataset(ws, size=100, offset=0, name=None):

caffe2/python/ideep/conv_op_test.py

@@ -4,7 +4,6 @@
 
 
 import unittest
-import sys
 import hypothesis.strategies as st
 from hypothesis import given, settings
 import numpy as np

caffe2/python/ideep/convfusion_op_test.py

@@ -5,8 +5,7 @@
 
 import unittest
 import hypothesis.strategies as st
-from hypothesis import given, settings
-import copy
+from hypothesis import given
 import numpy as np
 import math
 from caffe2.proto import caffe2_pb2

caffe2/python/ideep/dropout_op_test.py

@@ -7,8 +7,6 @@
 from hypothesis import given
 import hypothesis.strategies as st
 import numpy as np
-
-from caffe2.proto import caffe2_pb2
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu
 import caffe2.python.ideep_test_util as mu

caffe2/python/ideep/order_switch_op_test.py

@@ -10,7 +10,6 @@
 import caffe2.python.ideep_test_util as mu
 
 from hypothesis import given, settings
-from caffe2.proto import caffe2_pb2
 from caffe2.python import core, workspace
 
 

caffe2/python/ideep/shape_op_test.py

@@ -7,7 +7,6 @@
 import hypothesis.strategies as st
 from hypothesis import given, settings
 import numpy as np
-from caffe2.proto import caffe2_pb2
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu
 import caffe2.python.ideep_test_util as mu

caffe2/python/ideep/spatial_bn_op_test.py

@@ -7,9 +7,8 @@
 import hypothesis.strategies as st
 import numpy as np
 import unittest
-from caffe2.python import brew, core, workspace
+from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu
-from caffe2.python.model_helper import ModelHelper
 import caffe2.python.ideep_test_util as mu
 
 

caffe2/python/ideep/test_ideep_net.py

@@ -9,7 +9,6 @@
 import numpy as np
 import argparse
 import time
-import os.path
 
 
 def GetArgumentParser():

caffe2/python/ideep/transform_ideep_net.py

@@ -6,7 +6,6 @@
 import argparse
 import copy
 import json
-import os.path
 
 import numpy as np
 

caffe2/python/ideep/transpose_op_test.py

@@ -7,7 +7,6 @@
 import hypothesis.strategies as st
 from hypothesis import given, settings
 import numpy as np
-from caffe2.proto import caffe2_pb2
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu
 import caffe2.python.ideep_test_util as mu

caffe2/python/ideep_test_util.py

@@ -14,7 +14,6 @@
 import hypothesis.strategies as st
 
 from caffe2.proto import caffe2_pb2
-from caffe2.python import workspace
 from caffe2.python import hypothesis_test_util as hu
 
 cpu_do = hu.cpu_do

caffe2/python/layer_model_helper.py

@@ -17,7 +17,6 @@
 from caffe2.python.optimizer import get_param_device, Optimizer
 from caffe2.python.regularizer import Regularizer, RegularizationBy
 from caffe2.python.layers import layers
-from caffe2.proto import caffe2_pb2
 from future.utils import viewitems, viewvalues
 
 import logging

caffe2/python/mkl/mkl_LRN_op_test.py

@@ -5,7 +5,7 @@
 
 import unittest
 import hypothesis.strategies as st
-from hypothesis import given, settings
+from hypothesis import given
 import numpy as np
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu

caffe2/python/mkl/mkl_LRN_speed_test.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 from caffe2.proto import caffe2_pb2
-from caffe2.python import cnn, core, workspace, test_util
+from caffe2.python import core, workspace, test_util
 
 
 @unittest.skipIf(not workspace.C.has_mkldnn, "Skipping as we do not have mkldnn.")

caffe2/python/mkl/mkl_conv_op_test.py

@@ -5,7 +5,7 @@
 
 import unittest
 import hypothesis.strategies as st
-from hypothesis import given, settings
+from hypothesis import given
 import numpy as np
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu

caffe2/python/mkl/mkl_fc_op_test.py

@@ -5,7 +5,7 @@
 
 import unittest
 import hypothesis.strategies as st
-from hypothesis import given, settings
+from hypothesis import given
 import numpy as np
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu

caffe2/python/mkl/mkl_fc_speed_test.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 from caffe2.proto import caffe2_pb2
-from caffe2.python import cnn, core, workspace, test_util
+from caffe2.python import core, workspace, test_util
 
 
 @unittest.skipIf(not workspace.C.has_mkldnn, "Skipping as we do not have mkldnn.")

caffe2/python/mkl/mkl_fill_op_test.py

@@ -5,8 +5,7 @@
 
 import unittest
 import hypothesis.strategies as st
-from hypothesis import given, settings
-import numpy as np
+from hypothesis import given
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu
 import caffe2.python.mkl_test_util as mu

caffe2/python/mkl/mkl_pool_speed_test.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 from caffe2.proto import caffe2_pb2
-from caffe2.python import cnn, core, workspace, test_util
+from caffe2.python import core, workspace, test_util
 
 
 @unittest.skipIf(not workspace.C.has_mkldnn, "Skipping as we do not have mkldnn.")

caffe2/python/mkl/mkl_sbn_op_test.py

@@ -5,7 +5,7 @@
 
 import unittest
 import hypothesis.strategies as st
-from hypothesis import given, settings
+from hypothesis import given
 import numpy as np
 from caffe2.python import core, workspace
 import caffe2.python.hypothesis_test_util as hu

caffe2/python/mkl/mkl_sbn_speed_test.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 from caffe2.proto import caffe2_pb2
-from caffe2.python import cnn, core, workspace, test_util
+from caffe2.python import core, workspace, test_util
 
 
 @unittest.skipIf(not workspace.C.has_mkldnn, "Skipping as we do not have mkldnn.")

caffe2/python/mkl/mkl_speed_test.py

@@ -6,7 +6,7 @@
 
 import numpy as np
 from caffe2.proto import caffe2_pb2
-from caffe2.python import cnn, core, workspace, test_util
+from caffe2.python import core, workspace, test_util
 
 
 @unittest.skipIf(not workspace.C.has_mkldnn, "Skipping as we do not have mkldnn.")

caffe2/python/mkl/rewrite_graph.py

@@ -6,7 +6,6 @@
 import copy
 from caffe2.proto import caffe2_pb2
 from caffe2.python import core
-import caffe2.python._import_c_extension as C
 
 
 def rewrite_init_net_simple(net):

caffe2/python/nomnigraph_test.py

@@ -3,7 +3,7 @@
 
 
 
-from caffe2.python import core, workspace, test_util
+from caffe2.python import core, test_util
 from caffe2.proto import caffe2_pb2
 import caffe2.python.nomnigraph as ng
 

caffe2/python/onnx/backend.py

@@ -5,14 +5,7 @@
 
 To run this, you will need to have Caffe2 installed as well.
 """
-
-
-
-
-
-import os
 import collections
-from subprocess import Popen, PIPE
 import sys
 import zipfile
 import itertools
@@ -23,16 +16,14 @@
 # importing onnx first, which will cause it to go out and pick up the
 # system protobuf.
 import onnx.backend
-
-import caffe2
 from caffe2.python import core, workspace, rnn_cell, gru_cell
 from caffe2.python.compatibility import container_abcs
 from caffe2.python.model_helper import ModelHelper
 from caffe2.proto import caffe2_pb2
 import caffe2.python.utils
 import numpy as np
 import onnx
-from onnx import checker, GraphProto, TensorProto, AttributeProto, ModelProto
+from onnx import TensorProto
 import onnx.numpy_helper
 import onnx.defs
 import onnx.optimizer
@@ -42,7 +33,6 @@
 
 from caffe2.python.onnx.workspace import Workspace
 from caffe2.python.onnx.backend_rep import Caffe2Rep
-from caffe2.python.onnx.backend_cpp_rep import Caffe2CppRep
 
 import caffe2.python._import_c_extension as C
 

caffe2/python/onnx/bin/conversion.py

@@ -9,8 +9,7 @@
 
 from caffe2.proto import caffe2_pb2
 import click
-import numpy as np
-from onnx import checker, ModelProto
+from onnx import ModelProto
 
 from caffe2.python.onnx.backend import Caffe2Backend as c2
 import caffe2.python.onnx.frontend as c2_onnx

caffe2/python/onnx/frontend.py

@@ -17,15 +17,12 @@
 
 from caffe2.python import core as caffe2_core
 from caffe2.python.compatibility import container_abcs
-from caffe2.proto import caffe2_legacy_pb2
-from enum import Enum
-from onnx import (defs, checker, helper, numpy_helper, mapping,
-                  ModelProto, GraphProto, NodeProto, AttributeProto, TensorProto, OperatorSetIdProto)
-from onnx.helper import make_tensor, make_tensor_value_info, make_attribute, make_model
+from onnx import (checker, helper, numpy_helper, mapping,
+                  GraphProto, NodeProto, TensorProto, OperatorSetIdProto)
+from onnx.helper import make_tensor_value_info, make_model
 import numpy as np
 
 from caffe2.python.onnx.helper import c2_native_run_net
-from caffe2.python.onnx.error import Unsupported
 
 import caffe2.python._import_c_extension as C
 

caffe2/python/onnx/helper.py

@@ -9,9 +9,6 @@
 from onnx.backend.base import namedtupledict
 
 from caffe2.python.onnx.workspace import Workspace
-import caffe2.python._import_c_extension as C
-
-import io
 import logging
 import time
 

caffe2/python/onnx/onnxifi.py

@@ -11,9 +11,7 @@
 
 
 from caffe2.proto import caffe2_pb2
-from caffe2.python import core, workspace
 import caffe2.python._import_c_extension as C
-import numpy as np
 
 
 def onnxifi_caffe2_net(

caffe2/python/onnx/test_onnxifi.py

@@ -3,16 +3,14 @@
 
 
 
-import json
 import numpy as np
-import os
 import time
 import unittest
 
 import onnx
 import onnx.defs
 from onnx.backend.base import namedtupledict
-from onnx.helper import make_node, make_graph, make_tensor, make_tensor_value_info, make_model
+from onnx.helper import make_node, make_graph, make_tensor_value_info, make_model
 from caffe2.proto import caffe2_pb2
 from caffe2.python import core, workspace
 from caffe2.python.models.download import ModelDownloader

caffe2/python/onnx/tests/c2_ref_test.py

@@ -6,7 +6,6 @@
 
 
 
-import json
 import os
 import unittest
 
@@ -17,7 +16,7 @@
 from onnx.helper import make_node, make_graph, make_tensor, make_tensor_value_info, make_model
 from caffe2.python.onnx.helper import c2_native_run_net, c2_native_run_op
 
-from onnx import defs, mapping
+from onnx import mapping
 import caffe2.python.onnx.frontend as c2_onnx
 import caffe2.python.onnx.backend as c2