fix test error

Author: sunxd3

test/ext/DynamicPPLMCMCChainsExt.jl

@@ -75,10 +75,12 @@ end
         DynamicPPL.LogDensityFunction(m_lin_reg, DynamicPPL.VarInfo(m_lin_reg)),
         AdvancedHMC.NUTS(0.65),
         MCMCThreads(),
-        200,
+        1000,
         2;
         chain_type=MCMCChains.Chains,
         param_names=[:β],
+        discard_initial=100,
+        n_adapt=100,
     )
     m_lin_reg_test = linear_reg(xs_test, fill(missing, length(ys_test)))
     predictions = DynamicPPL.predict(m_lin_reg_test, chain_lin_reg)
@@ -158,9 +160,10 @@ end
                           [simple_linear1, simple_linear2, simple_linear3, simple_linear4]
         m = model(x, y)
         chain = sample(
-            DynamicPPL.LogDensityFunction(m, DynamicPPL.VarInfo(m)),
+            DynamicPPL.LogDensityFunction(m),
             AdvancedHMC.NUTS(0.65),
-            1000;
+            400;
+            initial_params = rand(4),
             chain_type=MCMCChains.Chains,
             param_names=param_names[model],
             discard_initial=100,