Add linspace and logspace implementations in OpenVINO NumPy backend (#21613)

* Added logspace and linespace numpy implemation

* Minor changes

* Added Changes suggested by BOT

* Minor changes

* Minor changes

* Minor changes

* Minor Changes

* Minor Changes

* Performed the Suggested Changes

* Performed the Suggested Changes

---------

Co-authored-by: hertschuh <[email protected]>

Author: arunthakur009

keras/src/backend/openvino/excluded_concrete_tests.txt

@@ -39,9 +39,7 @@ NumpyDtypeTest::test_isnan
 NumpyDtypeTest::test_isposinf
 NumpyDtypeTest::test_kron
 NumpyDtypeTest::test_lcm
-NumpyDtypeTest::test_linspace
 NumpyDtypeTest::test_logaddexp2
-NumpyDtypeTest::test_logspace
 NumpyDtypeTest::test_matmul_
 NumpyDtypeTest::test_max
 NumpyDtypeTest::test_mean
@@ -142,8 +140,6 @@ NumpyTwoInputOpsCorrectnessTest::test_inner
 NumpyTwoInputOpsCorrectnessTest::test_isin
 NumpyTwoInputOpsCorrectnessTest::test_kron
 NumpyTwoInputOpsCorrectnessTest::test_lcm
-NumpyTwoInputOpsCorrectnessTest::test_linspace
-NumpyTwoInputOpsCorrectnessTest::test_logspace
 NumpyTwoInputOpsCorrectnessTest::test_quantile
 NumpyTwoInputOpsCorrectnessTest::test_tensordot
 NumpyTwoInputOpsCorrectnessTest::test_vdot

keras/src/backend/openvino/numpy.py

@@ -1038,9 +1038,131 @@ def less_equal(x1, x2):
 def linspace(
     start, stop, num=50, endpoint=True, retstep=False, dtype=None, axis=0
 ):
-    raise NotImplementedError(
-        "`linspace` is not supported with openvino backend"
+    """Return evenly spaced numbers over a specified interval.
+
+    Supports axis=0 (prepend) and axis=-1 (append). Intermediate axis values are
+    treated as axis=-1.
+
+    If `retstep` is True, also returns the step size between values.
+
+    """
+
+    start = get_ov_output(start)
+    stop = get_ov_output(stop)
+
+    if hasattr(num, "output") or isinstance(num, OpenVINOKerasTensor):
+        num_tensor = get_ov_output(num)
+        try:
+            if num_tensor.get_node().get_type_name() == "Constant":
+                num_value = num_tensor.get_node().get_vector()[0]
+                num = int(num_value)
+            else:
+                raise NotImplementedError(
+                    "Dynamic num values not fully supported"
+                )
+        except Exception as e:
+            raise NotImplementedError(
+                "Could not extract num value from tensor"
+            ) from e
+    else:
+        num = int(num)
+
+    if dtype is None:
+        output_type = OPENVINO_DTYPES[config.floatx()]
+    else:
+        output_type = OPENVINO_DTYPES[dtype]
+
+    start = ov_opset.convert(start, output_type).output(0)
+    stop = ov_opset.convert(stop, output_type).output(0)
+
+    if num < 0:
+        raise ValueError("Number of samples, `num`, must be non-negative.")
+
+    if num == 0:
+        empty_shape = ov_opset.constant([0], Type.i32).output(0)
+        result = ov_opset.broadcast(
+            ov_opset.constant(0.0, output_type).output(0), empty_shape
+        ).output(0)
+        if retstep:
+            nan_step = ov_opset.constant(np.nan, output_type).output(0)
+            return OpenVINOKerasTensor(result), OpenVINOKerasTensor(nan_step)
+        return OpenVINOKerasTensor(result)
+
+    if num == 1:
+        result_val = start
+        axis_const = ov_opset.constant([axis], Type.i32).output(0)
+        result = ov_opset.unsqueeze(result_val, axis_const).output(0)
+        if retstep:
+            if endpoint:
+                step = ov_opset.constant(np.nan, output_type).output(0)
+            else:
+                step = ov_opset.subtract(stop, start).output(0)
+            return OpenVINOKerasTensor(result), OpenVINOKerasTensor(step)
+    zero_i32 = ov_opset.constant(0, Type.i32).output(0)
+    one_i32 = ov_opset.constant(1, Type.i32).output(0)
+    one_i32_array = ov_opset.constant([1], Type.i32).output(0)
+
+    num_const = ov_opset.constant(num, output_type).output(0)
+
+    if endpoint:
+        divisor = ov_opset.subtract(
+            num_const, ov_opset.constant(1, output_type).output(0)
+        ).output(0)
+    else:
+        divisor = num_const
+
+    step = ov_opset.divide(
+        ov_opset.subtract(stop, start).output(0), divisor
+    ).output(0)
+
+    indices = ov_opset.range(
+        zero_i32,
+        ov_opset.constant(num, Type.i32).output(0),
+        one_i32,
+        output_type,
+    ).output(0)
+
+    start_shape = ov_opset.convert(
+        ov_opset.shape_of(start).output(0), Type.i32
+    ).output(0)
+    indices_shape = ov_opset.convert(
+        ov_opset.shape_of(indices).output(0), Type.i32
+    ).output(0)
+
+    start_rank = ov_opset.shape_of(start_shape).output(0)
+    ones_for_start = ov_opset.broadcast(one_i32, start_rank).output(0)
+
+    if axis == 0:
+        indices_target_shape = ov_opset.concat(
+            [indices_shape, ones_for_start], 0
+        ).output(0)
+        start_target_shape = ov_opset.concat(
+            [one_i32_array, start_shape], 0
+        ).output(0)
+    else:
+        indices_target_shape = ov_opset.concat(
+            [ones_for_start, indices_shape], 0
+        ).output(0)
+        start_target_shape = ov_opset.concat(
+            [start_shape, one_i32_array], 0
+        ).output(0)
+
+    indices_reshaped = ov_opset.reshape(
+        indices, indices_target_shape, False
+    ).output(0)
+    start_reshaped = ov_opset.reshape(start, start_target_shape, False).output(
+        0
+    )
+    step_reshaped = ov_opset.reshape(step, start_target_shape, False).output(0)
+
+    scaled_indices = ov_opset.multiply(indices_reshaped, step_reshaped).output(
+        0
     )
+    result = ov_opset.add(start_reshaped, scaled_indices).output(0)
+
+    if retstep:
+        return OpenVINOKerasTensor(result), OpenVINOKerasTensor(step)
+    return OpenVINOKerasTensor(result)
 
 
 def log(x):
@@ -1171,10 +1293,30 @@ def logical_or(x1, x2):
 
 
 def logspace(start, stop, num=50, endpoint=True, base=10, dtype=None, axis=0):
-    raise NotImplementedError(
-        "`logspace` is not supported with openvino backend"
+    linear_samples = linspace(
+        start=start,
+        stop=stop,
+        num=num,
+        endpoint=endpoint,
+        retstep=False,
+        dtype=dtype,
+        axis=axis,
     )
 
+    if dtype is None:
+        output_type = OPENVINO_DTYPES[config.floatx()]
+    else:
+        output_type = OPENVINO_DTYPES[dtype]
+
+    linear_output = get_ov_output(linear_samples)
+    base_tensor = get_ov_output(base)
+
+    base_tensor = ov_opset.convert(base_tensor, output_type).output(0)
+
+    result = ov_opset.power(base_tensor, linear_output).output(0)
+
+    return OpenVINOKerasTensor(result)
+
 
 def maximum(x1, x2):
     x1 = get_ov_output(x1)