Attempt to add support for scipy.signal.gauss_spline

Author: PabloRoque

pytensor/tensor/ssignal.py

@@ -0,0 +1,38 @@
+from pytensor.tensor import Op, as_tensor_variable
+from pytensor.graph.basic import Apply 
+import pytensor.tensor as pt
+from pytensor.tensor.type import TensorType
+import scipy.signal as scipy_signal
+
+
+class GaussSpline(Op):
+    __props__ = ("n",)
+
+    def __init__(self, n: int = None):
+        self.n = n
+
+    def make_node(self, knots):
+        knots = as_tensor_variable(knots)
+        if not isinstance(knots.type, TensorType):
+            raise TypeError("Input must be a TensorType")
+
+        if not isinstance(self.n, int) or self.n is None or self.n < 0:
+            raise ValueError("n must be a non-negative integer")
+
+        if knots.ndim < 1:
+            raise TypeError("Input must be at least 1-dimensional")
+
+        out = knots.type()
+        return Apply(self, [knots], [out])
+
+    def perform(self, node, inputs, output_storage):
+        [x] = inputs
+        [out] = output_storage
+        out[0] = scipy_signal.gauss_spline(x, self.n)
+
+    def infer_shape(self, fgraph, node, shapes):
+        return [shapes[0]]
+
+
+def gauss_spline(x, n):
+    return GaussSpline(n)(x)

tests/tensor/test_ssignal.py

@@ -0,0 +1,34 @@
+from pytensor.tensor.ssignal import GaussSpline, gauss_spline
+from pytensor.tensor.type import matrix
+from pytensor import function
+from pytensor import tensor as pt
+import numpy as np
+import pytest
+from tests import unittest_tools as utt
+
+import scipy.signal as scipy_signal
+
+class TestGaussSpline(utt.InferShapeTester):
+    
+    def setup_method(self):
+        super().setup_method()
+        self.op_class = GaussSpline
+        self.op = gauss_spline
+
+    @pytest.mark.parametrize("n", [-1, 1.5, None, "string"])
+    def test_make_node_raises(self, n):
+        a = matrix()
+        with pytest.raises(ValueError, match="n must be a non-negative integer"):
+            self.op(a, n=n)
+        
+    def test_perform(self):
+        a = matrix()
+        f = function([a], self.op(a, n=10))
+        a = np.random.random((8, 6))
+        assert np.allclose(f(a), scipy_signal.gauss_spline(a, 10))
+
+    def test_infer_shape(self):
+        a = matrix()
+        self._compile_and_check(
+            [a], [self.op(a, 16)], [np.random.random((12, 4))], self.op_class
+        )