!13669 modify example

From: @lijiaqi0612
Reviewed-by: @kingxian,@kisnwang
Signed-off-by: @kingxian

mindspore/nn/loss/loss.py

@@ -436,7 +436,7 @@ class DiceLoss(_Loss):
         >>> y = Tensor(np.array([[0, 1], [1, 0], [0, 1]]), mstype.float32)
         >>> output = loss(y_pred, y)
         >>> print(output)
-        [0.38596618]
+        0.38596618
     """
     def __init__(self, smooth=1e-5):
         super(DiceLoss, self).__init__()
@@ -1031,7 +1031,11 @@ class FocalLoss(_Loss):
     r"""
     The loss function proposed by Kaiming team in their paper ``Focal Loss for Dense Object Detection`` improves the
     effect of image object detection. It is a loss function to solve the imbalance of categories and the difference of
-    classification difficulty.
+    classification difficulty. If you want to learn more, please refer to the paper.
+    `https://arxiv.org/pdf/1708.02002.pdf`. The function is shown as follows:
+
+    .. math::
+        FL(p_t) = -(1-p_t)^\gamma log(p_t)
 
     Args:
         gamma (float): Gamma is used to adjust the steepness of weight curve in focal loss. Default: 2.0.
@@ -1053,14 +1057,14 @@ class FocalLoss(_Loss):
         Tensor, it's a tensor with the same shape and type as input `predict`.
 
     Raises:
-        TypeError: If the data type of ``gamma`` is not float..
-        TypeError: If ``weight`` is not a Parameter.
+        TypeError: If the data type of ``gamma`` is not float.
+        TypeError: If ``weight`` is not a Tensor.
         ValueError: If ``target`` dim different from ``predict``.
         ValueError: If ``target`` channel is not 1 and ``target`` shape is different from ``predict``.
         ValueError: If ``reduction`` is not one of 'none', 'mean', 'sum'.
 
     Supported Platforms:
-        ``Ascend`` ``GPU``
+        ``Ascend``
 
     Example:
         >>> predict = Tensor([[0.8, 1.4], [0.5, 0.9], [1.2, 0.9]], mstype.float32)

mindspore/nn/metrics/auc.py

@@ -32,14 +32,18 @@ def auc(x, y, reorder=False):
     Returns:
         area (float): Compute result.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> y_pred = np.array([[3, 0, 1], [1, 3, 0], [1, 0, 2]])
         >>> y = np.array([[0, 2, 1], [1, 2, 1], [0, 0, 1]])
-        >>> metric = ROC(pos_label=2)
+        >>> metric = nn.ROC(pos_label=2)
         >>> metric.clear()
         >>> metric.update(y_pred, y)
         >>> fpr, tpr, thre = metric.eval()
         >>> output = auc(fpr, tpr)
+        >>> print(output)
         0.5357142857142857
     """
     if not isinstance(x, np.ndarray) or not isinstance(y, np.ndarray):

mindspore/nn/metrics/bleu_score.py

@@ -27,6 +27,9 @@ class BleuScore(Metric):
         n_gram (int): The n_gram value ranged from 1 to 4. Default: 4
         smooth (bool): Whether or not to apply smoothing. Default: False
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Example:
         >>> candidate_corpus = [['i', 'have', 'a', 'pen', 'on', 'my', 'desk']]
         >>> reference_corpus = [[['i', 'have', 'a', 'pen', 'in', 'my', 'desk'],
@@ -35,6 +38,7 @@ class BleuScore(Metric):
         >>> metric.clear()
         >>> metric.update(candidate_corpus, reference_corpus)
         >>> bleu_score = metric.eval()
+        >>> print(output)
         0.5946035575013605
     """
     def __init__(self, n_gram=4, smooth=False):

mindspore/nn/metrics/confusion_matrix.py

@@ -39,10 +39,13 @@ class ConfusionMatrix(Metric):
 
         threshold (float): A threshold, which is used to compare with the input tensor. Default: 0.5.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> x = Tensor(np.array([1, 0, 1, 0]))
         >>> y = Tensor(np.array([1, 0, 0, 1]))
-        >>> metric = nn.ConfusionMatrix(num_classes=2, normalize=NO_NORM, threshold=0.5)
+        >>> metric = nn.ConfusionMatrix(num_classes=2, normalize='no_norm', threshold=0.5)
         >>> metric.clear()
         >>> metric.update(x, y)
         >>> output = metric.eval()
@@ -165,9 +168,12 @@ class ConfusionMatrixMetric(Metric):
                         calculation_method is True. Default: "mean". Choose from:
                         ["none", "mean", "sum", "mean_batch", "sum_batch", "mean_channel", "sum_channel"].
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> metric = ConfusionMatrixMetric(skip_channel=True, metric_name="tpr",
-        >>>                                calculation_method=False, decrease="mean")
+        ...                                calculation_method=False, decrease="mean")
         >>> metric.clear()
         >>> x = Tensor(np.array([[[0], [1]], [[1], [0]]]))
         >>> y = Tensor(np.array([[[0], [1]], [[0], [1]]]))

mindspore/nn/metrics/cosine_similarity.py

@@ -29,17 +29,21 @@ class CosineSimilarity(Metric):
 
     Return:
         A square matrix (input1, input1) with the similarity scores between all elements.
-        If sum or mean are used, then returns (b, 1) with the reduced value for each row
+        If sum or mean are used, then returns (b, 1) with the reduced value for each row.
+
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
 
     Example:
-        >>> test_data = np.random.randn(4, 8)
+        >>> test_data = np.array([[1, 3, 4, 7], [2, 4, 2, 5], [3, 1, 5, 8]])
         >>> metric = CosineSimilarity()
         >>> metric.clear()
         >>> metric.update(test_data)
         >>> square_matrix = metric.eval()
-        [[0. -0.14682831 0.19102288 -0.36204537]
-         ...
-         ]
+        >>> print(square_matrix)
+        [[0.  0.94025615  0.95162452]
+         [0.94025615  0.  0.86146098]
+         [0.95162452  0.86146098  0.]]
     """
     def __init__(self, similarity='cosine', reduction='none', zero_diagonal=True):
         super().__init__()

mindspore/nn/metrics/dice.py

@@ -32,6 +32,9 @@ class Dice(Metric):
         smooth (float): A term added to the denominator to improve numerical stability. Should be greater than 0.
                         Default: 1e-5.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> x = Tensor(np.array([[0.2, 0.5], [0.3, 0.1], [0.9, 0.6]]))
         >>> y = Tensor(np.array([[0, 1], [1, 0], [0, 1]]))

mindspore/nn/metrics/hausdorff_distance.py

@@ -86,10 +86,13 @@ class HausdorffDistance(Metric):
                      here the bounding box is achieved by (y_pred | y) which represents the union set of two images.
                      Default: True.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU``
+
     Examples:
         >>> x = Tensor(np.array([[3, 0, 1], [1, 3, 0], [1, 0, 2]]))
         >>> y = Tensor(np.array([[0, 2, 1], [1, 2, 1], [0, 0, 1]]))
-        >>> metric = nn.HausdorffDistance
+        >>> metric = nn.HausdorffDistance()
         >>> metric.clear()
         >>> metric.update(x, y, 0)
         >>> mean_average_distance = metric.eval()

mindspore/nn/metrics/mean_surface_distance.py

@@ -32,6 +32,9 @@ class MeanSurfaceDistance(Metric):
                           if sets ``symmetric = True``, the average symmetric surface distance between these two inputs
                           will be returned. Defaults: False.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> x = Tensor(np.array([[3, 0, 1], [1, 3, 0], [1, 0, 2]]))
         >>> y = Tensor(np.array([[0, 2, 1], [1, 2, 1], [0, 0, 1]]))

mindspore/nn/metrics/occlusion_sensitivity.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 # ============================================================================
 """OcclusionSensitivity."""
-from collections.abc import Sequence
 import numpy as np
 from mindspore import nn
 from mindspore.common.tensor import Tensor
@@ -47,16 +46,19 @@ class OcclusionSensitivity(Metric):
                           as the input image. If a bounding box is used, the output image will be cropped to this size.
                           Default: None.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU``
+
     Example:
         >>> class DenseNet(nn.Cell):
-        >>>     def init(self):
-        >>>         super(DenseNet, self).init()
-        >>>         w = np.array([[0.1, 0.8, 0.1, 0.1],[1, 1, 1, 1]]).astype(np.float32)
-        >>>         b = np.array([0.3, 0.6]).astype(np.float32)
-        >>>         self.dense = nn.Dense(4, 2, weight_init=Tensor(w), bias_init=Tensor(b))
-        >>>
-        >>>     def construct(self, x):
-        >>>         return self.dense(x)
+        ...     def init(self):
+        ...         super(DenseNet, self).init()
+        ...         w = np.array([[0.1, 0.8, 0.1, 0.1],[1, 1, 1, 1]]).astype(np.float32)
+        ...         b = np.array([0.3, 0.6]).astype(np.float32)
+        ...         self.dense = nn.Dense(4, 2, weight_init=Tensor(w), bias_init=Tensor(b))
+        ...
+        ...     def construct(self, x):
+        ...         return self.dense(x)
         >>>
         >>> model = DenseNet()
         >>> test_data = np.array([[0.1, 0.2, 0.3, 0.4]]).astype(np.float32)
@@ -65,6 +67,7 @@ class OcclusionSensitivity(Metric):
         >>> metric.clear()
         >>> metric.update(model, test_data, label)
         >>> score = metric.eval()
+        >>> print(score)
         [0.29999995    0.6    1    0.9]
     """
     def __init__(self, pad_val=0.0, margin=2, n_batch=128, b_box=None):

mindspore/nn/metrics/perplexity.py

@@ -32,6 +32,9 @@ class Perplexity(Metric):
         ignore_label (int): Index of an invalid label to be ignored when counting. If set to `None`, it will include all
                             entries. Default: -1.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> x = Tensor(np.array([[0.2, 0.5], [0.3, 0.1], [0.9, 0.6]]))
         >>> y = Tensor(np.array([1, 0, 1]))
@@ -39,6 +42,7 @@ class Perplexity(Metric):
         >>> metric.clear()
         >>> metric.update(x, y)
         >>> perplexity = metric.eval()
+        >>> print(perplexity)
         2.231443166940565
     """
 

mindspore/nn/metrics/roc.py

@@ -30,6 +30,9 @@ class ROC(Metric):
             to 1. For multiclass problems, this argument should not be set, as it is iteratively changed in the
             range [0,num_classes-1]. Default: None.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> # 1) binary classification example
         >>> x = Tensor(np.array([3, 1, 4, 2]))
@@ -38,8 +41,11 @@ class ROC(Metric):
         >>> metric.clear()
         >>> metric.update(x, y)
         >>> fpr, tpr, thresholds = metric.eval()
+        >>> print(fpr)
         [0., 0., 0.33333333, 0.6666667, 1.]
+        >>> print(tpr)
         [0., 1, 1., 1., 1.]
+        >>> print(thresholds)
         [5, 4, 3, 2, 1]
         >>>
         >>> # 2) multiclass classification example
@@ -50,9 +56,12 @@ class ROC(Metric):
         >>> metric.clear()
         >>> metric.update(x, y)
         >>> fpr, tpr, thresholds = metric.eval()
+        >>> print(fpr)
         [array([0., 0., 0.33333333, 0.66666667, 1.]), array([0., 0.33333333, 0.33333333, 1.]),
         array([0., 0.33333333, 1.]), array([0., 0., 1.])]
+        >>> print(tpr)
         [array([0., 1., 1., 1., 1.]), array([0., 0., 1., 1.]), array([0., 1., 1.]), array([0., 1., 1.])]
+        >>> print(thresholds)
         [array([1.28, 0.28, 0.2, 0.1, 0.05]), array([1.55, 0.55, 0.2, 0.05]), array([1.15, 0.15, 0.05]),
         array([1.75, 0.75, 0.05])]
     """

mindspore/nn/metrics/root_mean_square_surface_distance.py

@@ -33,6 +33,9 @@ class RootMeanSquareDistance(Metric):
                           if sets ``symmetric = True``, the average symmetric surface distance between these two inputs
                           will be returned. Defaults: False.
 
+    Supported Platforms:
+        ``Ascend`` ``GPU`` ``CPU``
+
     Examples:
         >>> x = Tensor(np.array([[3, 0, 1], [1, 3, 0], [1, 0, 2]]))
         >>> y = Tensor(np.array([[0, 2, 1], [1, 2, 1], [0, 0, 1]]))