diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/base/space_to_depth_base.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/base/space_to_depth_base.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/fp32/space_to_batch_fp32.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/fp32/space_to_batch_fp32.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/gather_parameter.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/gather_parameter.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/gatherNd_int8.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/gatherNd_int8.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/gather_int8.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/gather_int8.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/leaky_relu_int8.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/leaky_relu_int8.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/sigmoid_int8.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/sigmoid_int8.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/squeeze_int8.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/squeeze_int8.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/unsqueeze_int8.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/int8/unsqueeze_int8.h
old mode 100644
new mode 100755
diff --git a/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/space_to_depth_parameter.h b/mindspore/ccsrc/backend/kernel_compiler/cpu/nnacl/space_to_depth_parameter.h
old mode 100644
new mode 100755
diff --git a/mindspore/nn/metrics/perplexity.py b/mindspore/nn/metrics/perplexity.py
index 350f7a4c7f..fc3c330ab3 100644
--- a/mindspore/nn/metrics/perplexity.py
+++ b/mindspore/nn/metrics/perplexity.py
@@ -25,8 +25,7 @@ class Perplexity(Metric):
     sample. A low perplexity indicates the model can predict the sample well. The function is shown as follows:
 
     .. math::
-        b^{\\big(-\\frac{1}{N} \\sum_{i=1}^N \\log_b q(x_i) \\big)}
-        = \\exp \\big(-\\frac{1}{N} \\sum_{i=1}^N \\log q(x_i)\\big)
+        PP(W)=P(w_{1}w_{2}...w_{N})^{-\frac{1}{N}}=\sqrt[N]{\frac{1}{P(w_{1}w_{2}...w_{N})}}
 
     Args:
         ignore_label (int): Index of an invalid label to be ignored when counting. If set to `None`, it will include all