TST add divergence test for narx

Author: MatthewSZhang

.github/workflows/lint.yml

@@ -9,14 +9,14 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: prefix-dev/[email protected].3
+      - uses: prefix-dev/[email protected].4
         with:
           environments: default
           cache: true
 
       - name: Re-install local
         run: |
-          pixi run rebuild
+          pixi reinstall --frozen fastcan
 
       - name: Lint with ruff
         run: |

fastcan/narx.py

@@ -406,10 +406,10 @@ class NARX(MultiOutputMixin, RegressorMixin, BaseEstimator):
     >>> print_narx(narx)
     | yid |        Term        |   Coef   |
     =======================================
-    |  0  |     Intercept      |  1.008   |
-    |  0  |    y_hat[k-1,0]    |  0.498   |
-    |  0  |      X[k-2,0]      |  0.701   |
-    |  0  | X[k-1,0]*X[k-3,0]  |  1.496   |
+    |  0  |     Intercept      |  1.069   |
+    |  0  |    y_hat[k-1,0]    |  0.478   |
+    |  0  |      X[k-2,0]      |  0.716   |
+    |  0  | X[k-1,0]*X[k-3,0]  |  1.504   |
     """
 
     _parameter_constraints: dict = {