pytorch

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/**
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 * Copyright (c) 2016-present, Facebook, Inc.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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#include "caffe2/core/blob.h"
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#include "caffe2/core/init.h"
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#include "caffe2/core/tensor.h"
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#include "caffe2/core/logging.h"
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// We will be lazy and just use the whole namespace.
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using namespace caffe2;
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int main(int argc, char** argv) {
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  caffe2::GlobalInit(&argc, &argv);
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  caffe2::ShowLogInfoToStderr();
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  LOG(INFO) <<
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      "This script corresponds to the Blob part of the Caffe2 C++ "
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      "tutorial.";
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  LOG(INFO) << "Let's create a blob myblob.";
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  Blob myblob;
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  LOG(INFO) << "Let's set it to int and set the value to 10.";
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  int* myint = myblob.GetMutable<int>();
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  *myint = 10;
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  LOG(INFO)
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      << "Is the blob type int? "
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      << myblob.IsType<int>();
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  LOG(INFO)
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      << "Is the blob type float? "
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      << myblob.IsType<float>();
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  const int& myint_const = myblob.Get<int>();
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  LOG(INFO)
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      << "The value of the int number stored in the blob is: "
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      << myint_const;
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  LOG(INFO)
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      << "Let's try to get a float pointer. This will trigger an exception.";
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  try {
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    const float& myfloat = myblob.Get<float>();
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    LOG(FATAL) << "This line should never happen.";
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  } catch (std::exception& e) {
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    LOG(INFO)
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        << "As expected, we got an exception. Its content says: "
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        << e.what();
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  }
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  LOG(INFO) <<
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      "However, we can change the content type (and destroy the old "
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      "content) by calling GetMutable. Let's change it to double.";
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  double* mydouble = myblob.GetMutable<double>();
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  *mydouble = 3.14;
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  LOG(INFO) << "The new content is: " << myblob.Get<double>();
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  LOG(INFO) <<
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      "If we have a pre-created object, we can use Reset() to transfer the "
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      "object to a blob.";
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  std::string* pvec = new std::string();
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  myblob.Reset(pvec); // no need to release pvec, myblob takes ownership.
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  LOG(INFO) << "Is the blob now of type string? "
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            << myblob.IsType<std::string>();
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  LOG(INFO) << "This concludes the blob tutorial.";
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  return 0;
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}
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