Generated by Cython 0.29.24
Yellow lines hint at Python interaction.
Click on a line that starts with a "+
" to see the C code that Cython generated for it.
Raw output: _inner.cpp
+001: # Fast inner loop for EDBSCAN
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002: # Author: Ruben Broekx
003: #
004: # Code forked from Scikit-Learn's DBSCAN
005: # Author: Lars Buitinck
006: # License: 3-clause BSD
007: #
008: # cython: boundscheck=False, wraparound=False, infer_types=True
009:
010: cimport cython
011: from libcpp cimport bool
012: from libcpp.vector cimport vector
013: from libc.stdlib cimport malloc, free
014: cimport numpy as np
+015: import numpy as np
__pyx_t_1 = __Pyx_Import(__pyx_n_s_numpy, 0, -1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 15, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); if (PyDict_SetItem(__pyx_d, __pyx_n_s_np, __pyx_t_1) < 0) __PYX_ERR(0, 15, __pyx_L1_error) __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
016:
+017: np.import_array()
__pyx_t_2 = __pyx_f_5numpy_import_array(); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 17, __pyx_L1_error)
018:
019:
+020: cdef int pop(
static int __pyx_f_7edbscan_6_inner_pop(PyObject *__pyx_v_stack, PyArrayObject *__pyx_v_neighborhoods) { int __pyx_v_best_size; int __pyx_v_best_idx; int __pyx_v_idx; PyArrayObject *__pyx_v_neighborhood = 0; __Pyx_LocalBuf_ND __pyx_pybuffernd_neighborhood; __Pyx_Buffer __pyx_pybuffer_neighborhood; __Pyx_LocalBuf_ND __pyx_pybuffernd_neighborhoods; __Pyx_Buffer __pyx_pybuffer_neighborhoods; int __pyx_r; __Pyx_RefNannyDeclarations __Pyx_RefNannySetupContext("pop", 0); __pyx_pybuffer_neighborhood.pybuffer.buf = NULL; __pyx_pybuffer_neighborhood.refcount = 0; __pyx_pybuffernd_neighborhood.data = NULL; __pyx_pybuffernd_neighborhood.rcbuffer = &__pyx_pybuffer_neighborhood; __pyx_pybuffer_neighborhoods.pybuffer.buf = NULL; __pyx_pybuffer_neighborhoods.refcount = 0; __pyx_pybuffernd_neighborhoods.data = NULL; __pyx_pybuffernd_neighborhoods.rcbuffer = &__pyx_pybuffer_neighborhoods; { __Pyx_BufFmt_StackElem __pyx_stack[1]; if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer, (PyObject*)__pyx_v_neighborhoods, &__Pyx_TypeInfo_object, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 20, __pyx_L1_error) } __pyx_pybuffernd_neighborhoods.diminfo[0].strides = __pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_neighborhoods.diminfo[0].shape = __pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer.shape[0]; /* … */ /* function exit code */ __pyx_L1_error:; __Pyx_XDECREF(__pyx_t_1); __Pyx_XDECREF(__pyx_t_3); { PyObject *__pyx_type, *__pyx_value, *__pyx_tb; __Pyx_PyThreadState_declare __Pyx_PyThreadState_assign __Pyx_ErrFetch(&__pyx_type, &__pyx_value, &__pyx_tb); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer); __Pyx_ErrRestore(__pyx_type, __pyx_value, __pyx_tb);} __Pyx_WriteUnraisable("edbscan._inner.pop", __pyx_clineno, __pyx_lineno, __pyx_filename, 1, 0); __pyx_r = 0; goto __pyx_L2; __pyx_L0:; __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer); __pyx_L2:; __Pyx_XDECREF((PyObject *)__pyx_v_neighborhood); __Pyx_RefNannyFinishContext(); return __pyx_r; }
021: list stack,
022: np.ndarray[object, ndim=1] neighborhoods,
023: ):
024: """Pop index from stack with the highest density, calculated as number of neighbors."""
+025: cdef int best_size = -1
__pyx_v_best_size = -1;
+026: cdef int best_idx = -1
__pyx_v_best_idx = -1;
027: cdef int idx
028: cdef np.ndarray[np.npy_intp, ndim=1, mode='c'] neighborhood
029:
+030: for idx in stack:
if (unlikely(__pyx_v_stack == Py_None)) { PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable"); __PYX_ERR(0, 30, __pyx_L1_error) } __pyx_t_1 = __pyx_v_stack; __Pyx_INCREF(__pyx_t_1); __pyx_t_2 = 0; for (;;) { if (__pyx_t_2 >= PyList_GET_SIZE(__pyx_t_1)) break; #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS __pyx_t_3 = PyList_GET_ITEM(__pyx_t_1, __pyx_t_2); __Pyx_INCREF(__pyx_t_3); __pyx_t_2++; if (unlikely(0 < 0)) __PYX_ERR(0, 30, __pyx_L1_error) #else __pyx_t_3 = PySequence_ITEM(__pyx_t_1, __pyx_t_2); __pyx_t_2++; if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); #endif __pyx_t_4 = __Pyx_PyInt_As_int(__pyx_t_3); if (unlikely((__pyx_t_4 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 30, __pyx_L1_error) __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; __pyx_v_idx = __pyx_t_4; /* … */ } __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+031: neighborhood = neighborhoods[idx]
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+032: if neighborhood.shape[0] > best_size:
__pyx_t_10 = (((__pyx_v_neighborhood->dimensions[0]) > __pyx_v_best_size) != 0); if (__pyx_t_10) { /* … */ }
+033: best_size = neighborhood.shape[0]
__pyx_v_best_size = (__pyx_v_neighborhood->dimensions[0]);
+034: best_idx = idx
__pyx_v_best_idx = __pyx_v_idx;
035:
036: # Pop the best index from the stack.
+037: stack.remove(best_idx)
__pyx_t_1 = __Pyx_PyInt_From_int(__pyx_v_best_idx); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 37, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __pyx_t_3 = __Pyx_CallUnboundCMethod1(&__pyx_umethod_PyList_Type_remove, __pyx_v_stack, __pyx_t_1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 37, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
+038: return best_idx
__pyx_r = __pyx_v_best_idx; goto __pyx_L0;
039:
040:
+041: cdef int get_unlabeled(
static int __pyx_f_7edbscan_6_inner_get_unlabeled(PyArrayObject *__pyx_v_is_core, PyArrayObject *__pyx_v_neighborhoods, PyArrayObject *__pyx_v_labels) { int __pyx_v_best_size; int __pyx_v_best_idx; PyArrayObject *__pyx_v_neighborhood = 0; npy_intp __pyx_v_idx; __Pyx_LocalBuf_ND __pyx_pybuffernd_is_core; __Pyx_Buffer __pyx_pybuffer_is_core; __Pyx_LocalBuf_ND __pyx_pybuffernd_labels; __Pyx_Buffer __pyx_pybuffer_labels; __Pyx_LocalBuf_ND __pyx_pybuffernd_neighborhood; __Pyx_Buffer __pyx_pybuffer_neighborhood; __Pyx_LocalBuf_ND __pyx_pybuffernd_neighborhoods; __Pyx_Buffer __pyx_pybuffer_neighborhoods; int __pyx_r; __Pyx_RefNannyDeclarations __Pyx_RefNannySetupContext("get_unlabeled", 0); __pyx_pybuffer_neighborhood.pybuffer.buf = NULL; __pyx_pybuffer_neighborhood.refcount = 0; __pyx_pybuffernd_neighborhood.data = NULL; __pyx_pybuffernd_neighborhood.rcbuffer = &__pyx_pybuffer_neighborhood; __pyx_pybuffer_is_core.pybuffer.buf = NULL; __pyx_pybuffer_is_core.refcount = 0; __pyx_pybuffernd_is_core.data = NULL; __pyx_pybuffernd_is_core.rcbuffer = &__pyx_pybuffer_is_core; __pyx_pybuffer_neighborhoods.pybuffer.buf = NULL; __pyx_pybuffer_neighborhoods.refcount = 0; __pyx_pybuffernd_neighborhoods.data = NULL; __pyx_pybuffernd_neighborhoods.rcbuffer = &__pyx_pybuffer_neighborhoods; __pyx_pybuffer_labels.pybuffer.buf = NULL; __pyx_pybuffer_labels.refcount = 0; __pyx_pybuffernd_labels.data = NULL; __pyx_pybuffernd_labels.rcbuffer = &__pyx_pybuffer_labels; { __Pyx_BufFmt_StackElem __pyx_stack[1]; if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_is_core.rcbuffer->pybuffer, (PyObject*)__pyx_v_is_core, &__Pyx_TypeInfo_nn___pyx_t_5numpy_uint8_t, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 41, __pyx_L1_error) } __pyx_pybuffernd_is_core.diminfo[0].strides = __pyx_pybuffernd_is_core.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_is_core.diminfo[0].shape = __pyx_pybuffernd_is_core.rcbuffer->pybuffer.shape[0]; { __Pyx_BufFmt_StackElem __pyx_stack[1]; if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer, (PyObject*)__pyx_v_neighborhoods, &__Pyx_TypeInfo_object, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 41, __pyx_L1_error) } __pyx_pybuffernd_neighborhoods.diminfo[0].strides = __pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_neighborhoods.diminfo[0].shape = __pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer.shape[0]; { __Pyx_BufFmt_StackElem __pyx_stack[1]; if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_labels.rcbuffer->pybuffer, (PyObject*)__pyx_v_labels, &__Pyx_TypeInfo_nn_npy_intp, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 41, __pyx_L1_error) } __pyx_pybuffernd_labels.diminfo[0].strides = __pyx_pybuffernd_labels.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_labels.diminfo[0].shape = __pyx_pybuffernd_labels.rcbuffer->pybuffer.shape[0]; /* … */ /* function exit code */ __pyx_L1_error:; __Pyx_XDECREF(__pyx_t_6); { PyObject *__pyx_type, *__pyx_value, *__pyx_tb; __Pyx_PyThreadState_declare __Pyx_PyThreadState_assign __Pyx_ErrFetch(&__pyx_type, &__pyx_value, &__pyx_tb); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_is_core.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_labels.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer); __Pyx_ErrRestore(__pyx_type, __pyx_value, __pyx_tb);} __Pyx_WriteUnraisable("edbscan._inner.get_unlabeled", __pyx_clineno, __pyx_lineno, __pyx_filename, 1, 0); __pyx_r = 0; goto __pyx_L2; __pyx_L0:; __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_is_core.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_labels.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer); __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer); __pyx_L2:; __Pyx_XDECREF((PyObject *)__pyx_v_neighborhood); __Pyx_RefNannyFinishContext(); return __pyx_r; }
042: np.ndarray[np.uint8_t, ndim=1, mode='c'] is_core,
043: np.ndarray[object, ndim=1] neighborhoods,
044: np.ndarray[np.npy_intp, ndim=1, mode='c'] labels,
045: ):
046: """Get the best unlabeled core index."""
+047: cdef int best_size = -1
__pyx_v_best_size = -1;
+048: cdef int best_idx = -1
__pyx_v_best_idx = -1;
049: cdef np.ndarray[np.npy_intp, ndim=1, mode='c'] neighborhood
050:
+051: for idx in xrange(neighborhoods.shape[0]):
__pyx_t_1 = (__pyx_v_neighborhoods->dimensions[0]); __pyx_t_2 = __pyx_t_1; for (__pyx_t_3 = 0; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) { __pyx_v_idx = __pyx_t_3;
+052: if not is_core[idx]:
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+053: continue
goto __pyx_L3_continue;
+054: if labels[idx] != -2:
__pyx_t_4 = __pyx_v_idx; __pyx_t_5 = (((*__Pyx_BufPtrCContig1d(npy_intp *, __pyx_pybuffernd_labels.rcbuffer->pybuffer.buf, __pyx_t_4, __pyx_pybuffernd_labels.diminfo[0].strides)) != -2L) != 0); if (__pyx_t_5) { /* … */ }
+055: continue
goto __pyx_L3_continue;
056:
+057: neighborhood = neighborhoods[idx]
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+059: best_size = neighborhood.shape[0]
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061:
062: # Pop the best index from the stack.
+063: return best_idx
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064:
065:
+066: cdef bool value_in_array(
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067: int val,
068: vector[np.npy_intp] arr,
069: ):
070: """Check if the value exists in the array."""
071: cdef int i
072:
+073: for i in arr:
__pyx_t_1 = __pyx_v_arr.begin(); for (;;) { if (!(__pyx_t_1 != __pyx_v_arr.end())) break; __pyx_t_2 = *__pyx_t_1; ++__pyx_t_1; __pyx_v_i = __pyx_t_2; /* … */ }
+074: if i == val:
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+075: return True
__pyx_r = 1; goto __pyx_L0;
+076: return False
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077:
078:
+079: cdef int get_max_0(
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080: np.ndarray[np.npy_intp, ndim=1, mode='c'] arr,
081: ):
082: """Get the maximum value in the array, that is at least zero."""
+083: cdef int max_val = 0
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084: cdef int i, idx
085:
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+089: max_val = idx + 1
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+090: return max_val
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091:
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093: np.ndarray[np.npy_intp, ndim=1] neighborhood,
094: np.ndarray[np.npy_intp, ndim=1, mode='c'] labels,
095: ):
096: """Check if there's a conflict in the given neighborhood."""
097: cdef int label
098: cdef vector[np.npy_intp] seen
099:
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__pyx_t_1 = __Pyx_PyObject_GetItem(((PyObject *)__pyx_v_labels), ((PyObject *)__pyx_v_neighborhood)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 100, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); if (likely(PyList_CheckExact(__pyx_t_1)) || PyTuple_CheckExact(__pyx_t_1)) { __pyx_t_2 = __pyx_t_1; __Pyx_INCREF(__pyx_t_2); __pyx_t_3 = 0; __pyx_t_4 = NULL; } else { __pyx_t_3 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_t_1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 100, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __pyx_t_4 = Py_TYPE(__pyx_t_2)->tp_iternext; if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 100, __pyx_L1_error) } __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; for (;;) { if (likely(!__pyx_t_4)) { if (likely(PyList_CheckExact(__pyx_t_2))) { if (__pyx_t_3 >= PyList_GET_SIZE(__pyx_t_2)) break; #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS __pyx_t_1 = PyList_GET_ITEM(__pyx_t_2, __pyx_t_3); __Pyx_INCREF(__pyx_t_1); __pyx_t_3++; if (unlikely(0 < 0)) __PYX_ERR(0, 100, __pyx_L1_error) #else __pyx_t_1 = PySequence_ITEM(__pyx_t_2, __pyx_t_3); __pyx_t_3++; if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 100, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); #endif } else { if (__pyx_t_3 >= PyTuple_GET_SIZE(__pyx_t_2)) break; #if CYTHON_ASSUME_SAFE_MACROS && !CYTHON_AVOID_BORROWED_REFS __pyx_t_1 = PyTuple_GET_ITEM(__pyx_t_2, __pyx_t_3); __Pyx_INCREF(__pyx_t_1); __pyx_t_3++; if (unlikely(0 < 0)) __PYX_ERR(0, 100, __pyx_L1_error) #else __pyx_t_1 = PySequence_ITEM(__pyx_t_2, __pyx_t_3); __pyx_t_3++; if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 100, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); #endif } } else { __pyx_t_1 = __pyx_t_4(__pyx_t_2); if (unlikely(!__pyx_t_1)) { PyObject* exc_type = PyErr_Occurred(); if (exc_type) { if (likely(__Pyx_PyErr_GivenExceptionMatches(exc_type, PyExc_StopIteration))) PyErr_Clear(); else __PYX_ERR(0, 100, __pyx_L1_error) } break; } __Pyx_GOTREF(__pyx_t_1); } __pyx_t_5 = __Pyx_PyInt_As_int(__pyx_t_1); if (unlikely((__pyx_t_5 == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 100, __pyx_L1_error) __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0; __pyx_v_label = __pyx_t_5; /* … */ __pyx_L3_continue:; } __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
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109:
110:
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112: np.ndarray[np.uint8_t, ndim=1, mode='c'] is_core,
113: np.ndarray[object, ndim=1] neighborhoods,
114: np.ndarray[np.npy_intp, ndim=1, mode='c'] labels,
115: ):
116: """Inner-loop of the EDBSCAN algorithm."""
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118: cdef int i, idx, n_idx
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120: cdef np.ndarray[np.npy_intp, ndim=1, mode='c'] neighborhood
121:
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125:
126: # Density-first search, where the density is defined by the number of neighbors a component has.
127: # The algorithm expands the most dense core components first and ends at the non-core points.
128: # Non-core points are labeled as part of a component, but don't expand their neighborhoods.
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while (1) {
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132:
133: # Break if no unlabeled found
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goto __pyx_L7_break;
136:
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goto __pyx_L7_break;
141:
142: # Add to stack (new cluster found that doesn't lead to a conflict)
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145:
146: # Pop the most dense index in stack and expand if there's no conflict.
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__pyx_t_5 = __pyx_v_idx; __pyx_t_1 = (PyObject *) *__Pyx_BufPtrStrided1d(PyObject **, __pyx_pybuffernd_neighborhoods.rcbuffer->pybuffer.buf, __pyx_t_5, __pyx_pybuffernd_neighborhoods.diminfo[0].strides); __Pyx_INCREF((PyObject*)__pyx_t_1); if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 149, __pyx_L1_error) __pyx_t_9 = ((PyArrayObject *)__pyx_t_1); { __Pyx_BufFmt_StackElem __pyx_stack[1]; __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer); __pyx_t_4 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer, (PyObject*)__pyx_t_9, &__Pyx_TypeInfo_nn_npy_intp, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack); if (unlikely(__pyx_t_4 < 0)) { PyErr_Fetch(&__pyx_t_12, &__pyx_t_11, &__pyx_t_10); if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_neighborhood.rcbuffer->pybuffer, (PyObject*)__pyx_v_neighborhood, &__Pyx_TypeInfo_nn_npy_intp, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) { Py_XDECREF(__pyx_t_12); Py_XDECREF(__pyx_t_11); Py_XDECREF(__pyx_t_10); __Pyx_RaiseBufferFallbackError(); } else { PyErr_Restore(__pyx_t_12, __pyx_t_11, __pyx_t_10); } __pyx_t_12 = __pyx_t_11 = __pyx_t_10 = 0; } __pyx_pybuffernd_neighborhood.diminfo[0].strides = __pyx_pybuffernd_neighborhood.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_neighborhood.diminfo[0].shape = __pyx_pybuffernd_neighborhood.rcbuffer->pybuffer.shape[0]; if (unlikely(__pyx_t_4 < 0)) __PYX_ERR(0, 149, __pyx_L1_error) } __pyx_t_9 = 0; __Pyx_XDECREF_SET(__pyx_v_neighborhood, ((PyArrayObject *)__pyx_t_1)); __pyx_t_1 = 0;
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+151: for i in xrange(neighborhood.shape[0]):
__pyx_t_2 = (__pyx_v_neighborhood->dimensions[0]); __pyx_t_3 = __pyx_t_2; for (__pyx_t_4 = 0; __pyx_t_4 < __pyx_t_3; __pyx_t_4+=1) { __pyx_v_i = __pyx_t_4;
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__pyx_t_5 = __pyx_v_i; __pyx_v_n_idx = (*__Pyx_BufPtrCContig1d(npy_intp *, __pyx_pybuffernd_neighborhood.rcbuffer->pybuffer.buf, __pyx_t_5, __pyx_pybuffernd_neighborhood.diminfo[0].strides));
153: # Label if it's an unlabeled sample
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__pyx_t_5 = __pyx_v_n_idx; __pyx_t_6 = (((*__Pyx_BufPtrCContig1d(npy_intp *, __pyx_pybuffernd_labels.rcbuffer->pybuffer.buf, __pyx_t_5, __pyx_pybuffernd_labels.diminfo[0].strides)) == -2L) != 0); if (__pyx_t_6) { /* … */ } }
+155: labels[n_idx] = labels[idx]
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156:
157: # Only possible to expand if it's a core point
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+159: stack.append(n_idx)
__pyx_t_1 = __Pyx_PyInt_From_int(__pyx_v_n_idx); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 159, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __pyx_t_7 = __Pyx_PyList_Append(__pyx_v_stack, __pyx_t_1); if (unlikely(__pyx_t_7 == ((int)-1))) __PYX_ERR(0, 159, __pyx_L1_error) __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;