some new features

.venv/lib/python3.12/site-packages/sklearn/metrics/_dist_metrics.pxd.tp

@@ -0,0 +1,152 @@
+{{py:
+
+implementation_specific_values = [
+    # Values are the following ones:
+    #
+    # name_suffix, INPUT_DTYPE_t, INPUT_DTYPE
+    ('64', 'float64_t', 'np.float64'),
+    ('32', 'float32_t', 'np.float32')
+]
+
+}}
+from libc.math cimport sqrt, exp
+
+from ..utils._typedefs cimport float64_t, float32_t, int32_t, intp_t
+
+cdef class DistanceMetric:
+    pass
+
+{{for name_suffix, INPUT_DTYPE_t, INPUT_DTYPE in implementation_specific_values}}
+
+######################################################################
+# Inline distance functions
+#
+#  We use these for the default (euclidean) case so that they can be
+#  inlined.  This leads to faster computation for the most common case
+cdef inline float64_t euclidean_dist{{name_suffix}}(
+    const {{INPUT_DTYPE_t}}* x1,
+    const {{INPUT_DTYPE_t}}* x2,
+    intp_t size,
+) except -1 nogil:
+    cdef float64_t tmp, d=0
+    cdef intp_t j
+    for j in range(size):
+        tmp = <float64_t> (x1[j] - x2[j])
+        d += tmp * tmp
+    return sqrt(d)
+
+
+cdef inline float64_t euclidean_rdist{{name_suffix}}(
+    const {{INPUT_DTYPE_t}}* x1,
+    const {{INPUT_DTYPE_t}}* x2,
+    intp_t size,
+) except -1 nogil:
+    cdef float64_t tmp, d=0
+    cdef intp_t j
+    for j in range(size):
+        tmp = <float64_t>(x1[j] - x2[j])
+        d += tmp * tmp
+    return d
+
+
+cdef inline float64_t euclidean_dist_to_rdist{{name_suffix}}(const {{INPUT_DTYPE_t}} dist) except -1 nogil:
+    return dist * dist
+
+
+cdef inline float64_t euclidean_rdist_to_dist{{name_suffix}}(const {{INPUT_DTYPE_t}} dist) except -1 nogil:
+    return sqrt(dist)
+
+
+######################################################################
+# DistanceMetric{{name_suffix}} base class
+cdef class DistanceMetric{{name_suffix}}(DistanceMetric):
+    # The following attributes are required for a few of the subclasses.
+    # we must define them here so that cython's limited polymorphism will work.
+    # Because we don't expect to instantiate a lot of these objects, the
+    # extra memory overhead of this setup should not be an issue.
+    cdef float64_t p
+    cdef const float64_t[::1] vec
+    cdef const float64_t[:, ::1] mat
+    cdef intp_t size
+    cdef object func
+    cdef object kwargs
+
+    cdef {{INPUT_DTYPE_t}} dist(
+        self,
+        const {{INPUT_DTYPE_t}}* x1,
+        const {{INPUT_DTYPE_t}}* x2,
+        intp_t size,
+    ) except -1 nogil
+
+    cdef {{INPUT_DTYPE_t}} rdist(
+        self,
+        const {{INPUT_DTYPE_t}}* x1,
+        const {{INPUT_DTYPE_t}}* x2,
+        intp_t size,
+    ) except -1 nogil
+
+    cdef {{INPUT_DTYPE_t}} dist_csr(
+        self,
+        const {{INPUT_DTYPE_t}}* x1_data,
+        const int32_t* x1_indices,
+        const {{INPUT_DTYPE_t}}* x2_data,
+        const int32_t* x2_indices,
+        const int32_t x1_start,
+        const int32_t x1_end,
+        const int32_t x2_start,
+        const int32_t x2_end,
+        const intp_t size,
+    ) except -1 nogil
+
+    cdef {{INPUT_DTYPE_t}} rdist_csr(
+        self,
+        const {{INPUT_DTYPE_t}}* x1_data,
+        const int32_t* x1_indices,
+        const {{INPUT_DTYPE_t}}* x2_data,
+        const int32_t* x2_indices,
+        const int32_t x1_start,
+        const int32_t x1_end,
+        const int32_t x2_start,
+        const int32_t x2_end,
+        const intp_t size,
+    ) except -1 nogil
+
+    cdef int pdist(
+        self,
+        const {{INPUT_DTYPE_t}}[:, ::1] X,
+        {{INPUT_DTYPE_t}}[:, ::1] D,
+    ) except -1
+
+    cdef int cdist(
+        self,
+        const {{INPUT_DTYPE_t}}[:, ::1] X,
+        const {{INPUT_DTYPE_t}}[:, ::1] Y,
+        {{INPUT_DTYPE_t}}[:, ::1] D,
+    ) except -1
+
+    cdef int pdist_csr(
+        self,
+        const {{INPUT_DTYPE_t}}* x1_data,
+        const int32_t[::1] x1_indices,
+        const int32_t[::1] x1_indptr,
+        const intp_t size,
+        {{INPUT_DTYPE_t}}[:, ::1] D,
+    ) except -1 nogil
+
+    cdef int cdist_csr(
+        self,
+        const {{INPUT_DTYPE_t}}* x1_data,
+        const int32_t[::1] x1_indices,
+        const int32_t[::1] x1_indptr,
+        const {{INPUT_DTYPE_t}}* x2_data,
+        const int32_t[::1] x2_indices,
+        const int32_t[::1] x2_indptr,
+        const intp_t size,
+        {{INPUT_DTYPE_t}}[:, ::1] D,
+    ) except -1 nogil
+
+    cdef {{INPUT_DTYPE_t}} _rdist_to_dist(self, {{INPUT_DTYPE_t}} rdist) except -1 nogil
+
+    cdef {{INPUT_DTYPE_t}} _dist_to_rdist(self, {{INPUT_DTYPE_t}} dist) except -1 nogil
+
+{{endfor}}