105 lines
3.7 KiB
Cython
105 lines
3.7 KiB
Cython
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# Authors: Gilles Louppe <g.louppe@gmail.com>
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# Peter Prettenhofer <peter.prettenhofer@gmail.com>
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# Arnaud Joly <arnaud.v.joly@gmail.com>
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# Jacob Schreiber <jmschreiber91@gmail.com>
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# Nelson Liu <nelson@nelsonliu.me>
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#
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# License: BSD 3 clause
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# See _utils.pyx for details.
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cimport numpy as cnp
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from ._tree cimport Node
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from ..neighbors._quad_tree cimport Cell
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from ..utils._typedefs cimport float32_t, float64_t, intp_t, int32_t, uint32_t
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cdef enum:
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# Max value for our rand_r replacement (near the bottom).
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# We don't use RAND_MAX because it's different across platforms and
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# particularly tiny on Windows/MSVC.
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# It corresponds to the maximum representable value for
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# 32-bit signed integers (i.e. 2^31 - 1).
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RAND_R_MAX = 2147483647
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# safe_realloc(&p, n) resizes the allocation of p to n * sizeof(*p) bytes or
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# raises a MemoryError. It never calls free, since that's __dealloc__'s job.
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# cdef float32_t *p = NULL
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# safe_realloc(&p, n)
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# is equivalent to p = malloc(n * sizeof(*p)) with error checking.
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ctypedef fused realloc_ptr:
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# Add pointer types here as needed.
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(float32_t*)
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(intp_t*)
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(unsigned char*)
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(WeightedPQueueRecord*)
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(float64_t*)
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(float64_t**)
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(Node*)
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(Cell*)
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(Node**)
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cdef int safe_realloc(realloc_ptr* p, size_t nelems) except -1 nogil
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cdef cnp.ndarray sizet_ptr_to_ndarray(intp_t* data, intp_t size)
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cdef intp_t rand_int(intp_t low, intp_t high,
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uint32_t* random_state) noexcept nogil
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cdef float64_t rand_uniform(float64_t low, float64_t high,
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uint32_t* random_state) noexcept nogil
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cdef float64_t log(float64_t x) noexcept nogil
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# =============================================================================
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# WeightedPQueue data structure
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# =============================================================================
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# A record stored in the WeightedPQueue
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cdef struct WeightedPQueueRecord:
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float64_t data
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float64_t weight
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cdef class WeightedPQueue:
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cdef intp_t capacity
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cdef intp_t array_ptr
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cdef WeightedPQueueRecord* array_
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cdef bint is_empty(self) noexcept nogil
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cdef int reset(self) except -1 nogil
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cdef intp_t size(self) noexcept nogil
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cdef int push(self, float64_t data, float64_t weight) except -1 nogil
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cdef int remove(self, float64_t data, float64_t weight) noexcept nogil
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cdef int pop(self, float64_t* data, float64_t* weight) noexcept nogil
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cdef int peek(self, float64_t* data, float64_t* weight) noexcept nogil
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cdef float64_t get_weight_from_index(self, intp_t index) noexcept nogil
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cdef float64_t get_value_from_index(self, intp_t index) noexcept nogil
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# =============================================================================
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# WeightedMedianCalculator data structure
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# =============================================================================
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cdef class WeightedMedianCalculator:
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cdef intp_t initial_capacity
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cdef WeightedPQueue samples
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cdef float64_t total_weight
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cdef intp_t k
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cdef float64_t sum_w_0_k # represents sum(weights[0:k]) = w[0] + w[1] + ... + w[k-1]
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cdef intp_t size(self) noexcept nogil
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cdef int push(self, float64_t data, float64_t weight) except -1 nogil
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cdef int reset(self) except -1 nogil
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cdef int update_median_parameters_post_push(
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self, float64_t data, float64_t weight,
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float64_t original_median) noexcept nogil
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cdef int remove(self, float64_t data, float64_t weight) noexcept nogil
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cdef int pop(self, float64_t* data, float64_t* weight) noexcept nogil
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cdef int update_median_parameters_post_remove(
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self, float64_t data, float64_t weight,
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float64_t original_median) noexcept nogil
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cdef float64_t get_median(self) noexcept nogil
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