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Using activation SIGMOID_SYM paramerters are supposed to be 0.0 or 1.0 not 0.1

SIGMOID_SYM
Symmetrical sigmoid: f(x)=β∗(1−e−αx)/(1+e−αx

Note If you are using the default sigmoid activation function with the default parameter values fparam1=0 and fparam2=0 then the function used is y = 1.7159*tanh(2/3 * x), so the output will range from [-1.7159, 1.7159], instead of [0,1].

Using activation SIGMOID_SYM paramerters are supposed to be 0.0 0 or 1.0 1 not 0.1

SIGMOID_SYM
Symmetrical sigmoid: f(x)=β∗(1−e−αx)/(1+e−αxf(x)=β∗(1−e−αx)/(1+e−αx . . . . from Open CV documentation it says:-

Note If you are using the default sigmoid activation function with the default parameter values fparam1=0 and fparam2=0 then the function used is y = 1.7159*tanh(2/3 * x), so the output will range from [-1.7159, 1.7159], instead of [0,1].