numpy required for C++ library to work with python bindings

I've added Boost python bindings into a C++ library. Calling the initialization method of this C++ library from python will fail if numpy is not imported into python before importing my C++ library. There are no errors but the C++ library spits out it failed to initialize. Why would numpy be required in python for my boost bindings to work with this C++ library? See example below.

C++

```
// Boost imports I'm using
#include
#include
#include
using namespace boost;

static bool InitializePy() {
// Call library initialize here
}

BOOST_PYTHON_MODULE(test_lib)
{
python::def("initialize", InitializePy);
}
```

Python

```
# import numpy
import test_lib
# Without importing numpy, this initialization will fail
test_lib.initialize()
```

I can share more source if anyone would like a look but the way I see it, regardless of what else is being done in C++, numpy needing to be imported in python is odd to me.

Start by reproducing the failure with the shown BOOST_PYTHON_MODULE(test_lib) entry point, comparing Python runs with and without importing numpy first. Trace the initialization path behind test_lib.initialize() and gather enough source to determine whether the numpy import is required; done means explaining the dependency or identifying the failing initialization step.

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