Implement Orca Pytorch metrics (intel-analytics#3545)

* SparseCategoricalAccuracy

* SparseCategoricalAccuracy

* CategoricalAccuracy

* fix

* BinaryAccuracy

* Top5Accuracy

* UT

* license

python/orca/src/bigdl/orca/learn/metrics.py

@@ -168,6 +168,10 @@ def get_bigdl_metric(self):
             SparseCategoricalAccuracy as KerasSparseCategoricalAccuracy
         return KerasSparseCategoricalAccuracy()
 
+    def get_pytorch_metric(self):
+        from zoo.orca.learn.pytorch import pytorch_metrics
+        return pytorch_metrics.SparseCategoricalAccuracy()
+
     def get_name(self):
         return "SparseCategoricalAccuracy"
 
@@ -183,6 +187,10 @@ def get_bigdl_metric(self):
         from zoo.pipeline.api.keras.metrics import CategoricalAccuracy as KerasCategoricalAccuracy
         return KerasCategoricalAccuracy()
 
+    def get_pytorch_metric(self):
+        from zoo.orca.learn.pytorch import pytorch_metrics
+        return pytorch_metrics.CategoricalAccuracy()
+
     def get_name(self):
         return "CategoricalAccuracy"
 
@@ -198,6 +206,10 @@ def get_bigdl_metric(self):
         from zoo.pipeline.api.keras.metrics import BinaryAccuracy as KerasBinaryAccuracy
         return KerasBinaryAccuracy()
 
+    def get_pytorch_metric(self):
+        from zoo.orca.learn.pytorch import pytorch_metrics
+        return pytorch_metrics.BinaryAccuracy()
+
     def get_name(self):
         return "BinaryAccuracy"
 
@@ -217,5 +229,9 @@ def get_bigdl_metric(self):
         from zoo.pipeline.api.keras.metrics import Top5Accuracy as KerasTop5Accuracy
         return KerasTop5Accuracy()
 
+    def get_pytorch_metric(self):
+        from zoo.orca.learn.pytorch import pytorch_metrics
+        return pytorch_metrics.Top5Accuracy()
+
     def get_name(self):
         return "Top5Accuracy"

python/orca/src/bigdl/orca/learn/pytorch/pytorch_metrics.py

@@ -21,24 +21,171 @@ def _unify_input_formats(preds, target):
         raise ValueError("preds the same or one more dimensions than targets")
 
     if preds.ndim == target.ndim + 1:
-        preds = torch.argmax(preds, dim=1)
+        preds = torch.argmax(preds, dim=-1)
 
     if preds.ndim == target.ndim and preds.is_floating_point():
         preds = (preds >= 0.5).long()
     return preds, target
 
 
 class Accuracy:
+    """Calculates how often predictions matches labels.
 
-    def __init__(self):
+    For example, if `y_true` is tensor([1, 2, 3, 4])_ and `y_pred` is tensor([0, 2, 3, 4])
+    then the accuracy is 3/4 or .75.  If the weights were specified as
+    tensor([1, 1, 0, 0]) then the accuracy would be 1/2 or .5.
+
+    Usage:
 
+    ```python
+    acc = Accuracy()
+    acc(torch.tensor([0, 2, 3, 4]), torch.tensor([1, 2, 3, 4]))
+    assert acc.compute() == 0.75
+    ```
+    """
+
+    def __init__(self):
         self.correct = torch.tensor(0)
         self.total = torch.tensor(0)
 
     def __call__(self, preds, targets):
         preds, target = _unify_input_formats(preds, targets)
-        self.correct += torch.sum(preds == target)
+        self.correct += torch.sum(torch.eq(preds, targets))
         self.total += target.numel()
 
     def compute(self):
         return self.correct.float() / self.total
+
+
+class SparseCategoricalAccuracy:
+    """Calculates how often predictions matches integer labels.
+
+    For example, if `y_true` is tensor([[2], [1]]) and `y_pred` is
+    tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]]) then the categorical accuracy is 1/2 or .5.
+    If the weights were specified as tensor([0.7, 0.3]) then the categorical accuracy
+    would be .3. You can provide logits of classes as `y_pred`, since argmax of
+    logits and probabilities are same.
+
+    Usage:
+
+    ```python
+     acc = SparseCategoricalAccuracy()
+     acc(torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]]), torch.tensor([[2], [1]]))
+     assert acc.compute() == 0.5
+    ```
+    """
+
+    def __init__(self):
+        self.total = torch.tensor(0)
+        self.correct = torch.tensor(0)
+
+    def __call__(self, preds, targets):
+        batch_size = targets.size(0)
+        if preds.ndim == targets.ndim:
+            targets = torch.squeeze(targets, dim=-1)
+        preds = torch.argmax(preds, dim=-1)
+        preds = preds.type_as(targets)
+        self.correct += torch.sum(torch.eq(preds, targets))
+        self.total += batch_size
+
+    def compute(self):
+        return self.correct.float() / self.total
+
+
+class CategoricalAccuracy:
+    """Calculates how often predictions matches integer labels.
+
+    For example, if `y_true` is torch.tensor([[0, 0, 1], [0, 1, 0]]) and `y_pred` is
+    torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]]) then the categorical accuracy is 1/2 or .5.
+    If the weights were specified as tensor([0.7, 0.3]) then the categorical accuracy
+    would be .3. You can provide logits of classes as `y_pred`, since argmax of
+    logits and probabilities are same.
+
+    Usage:
+
+    ```python
+    pred = torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]])
+    target = torch.tensor([[0, 0, 1], [0, 1, 0]])
+    cacc = CategoricalAccuracy()
+    cacc(pred, target)
+    ```
+    """
+    def __init__(self):
+        self.total = torch.tensor(0)
+        self.correct = torch.tensor(0)
+
+    def __call__(self, preds, targets):
+        batch_size = targets.size(0)
+        self.correct += torch.sum(
+            torch.eq(
+                torch.argmax(preds, dim=-1), torch.argmax(targets, dim=-1)))
+        self.total += batch_size
+
+    def compute(self):
+        return self.correct.float() / self.total
+
+
+class BinaryAccuracy:
+    """Calculates how often predictions matches labels.
+
+    For example, if `y_true` is tensor([1, 1, 0, 0]) and `y_pred` is tensor([0.98, 1, 0, 0.6])
+    then the binary accuracy is 3/4 or .75.  If the weights were specified as
+    [1, 0, 0, 1] then the binary accuracy would be 1/2 or .5.
+
+    Usage:
+
+    ```python
+    target = torch.tensor([1, 1, 0, 0])
+    pred = torch.tensor([0.98, 1, 0, 0.6])
+    bac = BinaryAccuracy()
+    bac(pred, target)
+    assert bac.compute() == 0.75
+    ```
+    """
+
+    def __init__(self):
+        self.total = torch.tensor(0)
+        self.correct = torch.tensor(0)
+
+    def __call__(self, preds, targets, threshold=0.5):
+        batch_size = targets.size(0)
+        threshold = torch.tensor(threshold)
+        self.correct += torch.sum(
+            torch.eq(
+                torch.gt(preds, threshold), targets))
+        self.total += batch_size
+
+    def compute(self):
+        return self.correct.float() / self.total
+
+
+class Top5Accuracy:
+    """Computes how often integer targets are in the top `K` predictions.
+
+      Usage:
+
+      ```python
+      pred = torch.tensor([[0.1, 0.9, 0.8, 0.4, 0.5, 0.2],
+                         [0.05, 0.95, 0, 0.4, 0.5, 0.2]])
+      target = torch.tensor([2, 2])
+      top5acc = Top5Accuracy()
+      top5acc(pred, target)
+      assert top5acc.compute() == 0.5
+      ```
+    """
+
+    def __init__(self):
+        self.total = torch.tensor(0)
+        self.correct = torch.tensor(0)
+
+    def __call__(self, preds, targets):
+        batch_size = targets.size(0)
+        _, preds = preds.topk(5, dim=-1, largest=True, sorted=True)
+        preds = preds.type_as(targets).t()
+        targets = targets.view(1, -1).expand_as(preds)
+
+        self.correct += preds.eq(targets).view(-1).sum()
+        self.total += batch_size
+
+    def compute(self):
+        return self.correct.float() / self.total

python/orca/test/bigdl/orca/learn/test_metrics.py

@@ -0,0 +1,83 @@
+#
+# Copyright 2018 Analytics Zoo Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+import torch
+
+
+def test_torch_Accuracy():
+    from zoo.orca.learn.pytorch.pytorch_metrics import Accuracy
+    pred = torch.tensor([0, 2, 3, 4])
+    target = torch.tensor([1, 2, 3, 4])
+    acc = Accuracy()
+    acc(pred, target)
+    assert acc.compute() == 0.75
+    pred = torch.tensor([0, 2, 3, 4])
+    target = torch.tensor([1, 1, 2, 4])
+    acc(pred, target)
+    assert acc.compute() == 0.5
+
+
+def test_torch_BinaryAccuracy():
+    from zoo.orca.learn.pytorch.pytorch_metrics import BinaryAccuracy
+    target = torch.tensor([1, 1, 0, 0])
+    pred = torch.tensor([0.98, 1, 0, 0.6])
+    bac = BinaryAccuracy()
+    bac(pred, target)
+    assert bac.compute() == 0.75
+    target = torch.tensor([1, 1, 0, 0])
+    pred = torch.tensor([0.98, 1, 0, 0.6])
+    bac(pred, target, threshold=0.7)
+    assert bac.compute() == 0.875
+
+
+def test_torch_CategoricalAccuracy():
+    from zoo.orca.learn.pytorch.pytorch_metrics import CategoricalAccuracy
+    pred = torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]])
+    target = torch.tensor([[0, 0, 1], [0, 1, 0]])
+    cacc = CategoricalAccuracy()
+    cacc(pred, target)
+    assert cacc.compute() == 0.5
+    pred = torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]])
+    target = torch.tensor([[0, 1, 0], [0, 1, 0]])
+    cacc(pred, target)
+    assert cacc.compute() == 0.75
+
+
+def test_torch_SparseCategoricalAccuracy():
+    from zoo.orca.learn.pytorch.pytorch_metrics import SparseCategoricalAccuracy
+    pred = torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]])
+    target = torch.tensor([[2], [1]])
+    scacc = SparseCategoricalAccuracy()
+    scacc(pred, target)
+    assert scacc.compute() == 0.5
+    pred = torch.tensor([[0.1, 0.9, 0.8], [0.05, 0.95, 0]])
+    target = torch.tensor([2, 0])
+    scacc(pred, target)
+    assert scacc.compute() == 0.25
+
+
+def test_torch_Top5Accuracy():
+    from zoo.orca.learn.pytorch.pytorch_metrics import Top5Accuracy
+    pred = torch.tensor([[0.1, 0.9, 0.8, 0.4, 0.5, 0.2],
+                         [0.05, 0.95, 0, 0.4, 0.5, 0.2]])
+    target = torch.tensor([2, 2])
+    top5acc = Top5Accuracy()
+    top5acc(pred, target)
+    assert top5acc.compute() == 0.5
+    pred = torch.tensor([[0.1, 0.9, 0.8, 0.4, 0.5, 0.2],
+                         [0.05, 0.95, 0, 0.4, 0.5, 0.2]])
+    target = torch.tensor([[2], [1]])
+    top5acc(pred, target)
+    assert top5acc.compute() == 0.75