I have included the pos_weights in loss function
train_loss:1.2012622356414795  accuracy:0.4861111111111111 
train_loss:1.312620997428894  accuracy:0.4876543209876543 
train_loss:1.292380928993225  accuracy:0.4868827160493827 
train_loss:1.3908039331436157  accuracy:0.4691358024691358 
train_loss:1.4518522024154663  accuracy:0.4729938271604938 

train _loss is in between 1.5-1.2 and is not decreasing
I have tried different learning rates