[OpenVINO backend] Support numpy.expm1 (#21141)

* [OpenVINO backend] Support numpy.expm1

* remove a line with NumpyOneInputOpsCorrectnessTest::test_expm1

* does nothing

* does nothing

Author: Huanli-Gong

keras/src/backend/openvino/excluded_concrete_tests.txt

@@ -21,7 +21,6 @@ NumpyDtypeTest::test_diag
 NumpyDtypeTest::test_digitize
 NumpyDtypeTest::test_einsum
 NumpyDtypeTest::test_exp2
-NumpyDtypeTest::test_expm1
 NumpyDtypeTest::test_eye
 NumpyDtypeTest::test_flip
 NumpyDtypeTest::test_floor
@@ -91,7 +90,6 @@ NumpyOneInputOpsCorrectnessTest::test_cumprod
 NumpyOneInputOpsCorrectnessTest::test_diag
 NumpyOneInputOpsCorrectnessTest::test_diagonal
 NumpyOneInputOpsCorrectnessTest::test_exp2
-NumpyOneInputOpsCorrectnessTest::test_expm1
 NumpyOneInputOpsCorrectnessTest::test_flip
 NumpyOneInputOpsCorrectnessTest::test_floor_divide
 NumpyOneInputOpsCorrectnessTest::test_hstack

keras/src/backend/openvino/numpy.py

@@ -703,7 +703,15 @@ def expand_dims(x, axis):
 
 
 def expm1(x):
-    raise NotImplementedError("`expm1` is not supported with openvino backend")
+    x = get_ov_output(x)
+    x_type = x.get_element_type()
+    if x_type.is_integral():
+        ov_type = OPENVINO_DTYPES[config.floatx()]
+        x = ov_opset.convert(x, ov_type)
+    exp_x = ov_opset.exp(x).output(0)
+    const_one = ov_opset.constant(1, exp_x.get_element_type())
+    result = ov_opset.subtract(exp_x, const_one).output(0)
+    return OpenVINOKerasTensor(result)
 
 
 def flip(x, axis=None):